KNOWLEDGE NOTESKnowledge Notes
Explore curated knowledge, course notes and methods, with their existing content and sources preserved.
This index lists complete English editions. Additional Chinese notes and bilingual updates remain available in the Chinese index.
350knowledge notesGoogle Search Central Blog 5 years (2016-2020, ~302 posts): AMP launch and expansion (2016) + Mobile-First Indexing announcement (2016-11) + large-scale rollout (started 2018-03) + full web rollout (announced 2020-03, completed 2023-10) / new Search Console rebuild (2018) / HTTPS enforcement (2017-2018 Chrome marks Not Secure) / evergreen Googlebot (one-time upgrade to Chrome 74 in 2019-05) / precursors to the Helpful Content Update / internationalization of Webmaster Conferences / COVID response (virtual events, business hours pause) / Goodbye Flash (2019) / Rendertron / Dynamic Rendering / introduction of the Core Web Vitals concept (2020) / Speed report / Webmasters → Search Central rename (2020-11) / Removals report improvements / FAQ and How-to structured data launch (2019-05) / nofollow → sponsored/ugc (2019-09) / Indexing API for jobs (2018)
Google Search Central blog over 5 years (2016–2020, approximately 302 posts): AMP launch and expansion (2016) + Mobile-First Indexing announcement (November 2016) + large-scale rollout launch (starting March 2018) + full web rollout (announced March 2020, completed October 2023) / new Search Console rebuild (2018) / HTTPS push (Chrome marked "Not Secure" in 2017–2018) / evergreen Googlebot (one-time upgrade to Chrome 74 in May 2019) / premonition of the Helpful Content Update / internationalization of Webmaster Conferences / COVID response (online events, business suspension) / farewell to Flash (2019) / Rendertron / Dynamic Rendering / introduction of Core Web Vitals concept (2020) / Speed report / Webmasters → Search Central rename (November 2020) / Removals report improvements / FAQ and How-to structured data launch (May 2019) / nofollow → sponsored / ugc (September 2019) / Indexing API for jobs (2018)
Google Search Central Blog 6 years (2021-2026, ~211 posts): **Page Experience launch** (2021-05-Q2 mobile, 2022-Q1 desktop) + detailed Core Web Vitals / **Helpful Content Update** (2022-08-25, merged into core in 2024-03) / **Product reviews updates** series (2021-04, 2021-12, etc.) / **link spam update** (2021-07, 2022-12) / **site reputation abuse** (2024-03, 2024-11) / **AI generated content guidance** (2023-02) / **Helpful Content into core ranking system** (2024-03) / **INP into Core Web Vitals** (2023-05) / **August 2024 core update** / **AI Overviews / AI Mode** (2024-2025) / **2025-06 simplifying search results** (major SD cleanup) / **Crawling December 2024 series** (4-post educational series)/ **Robots Refresher 2025 series** / **back button hijacking spam policy** (2026-04) / **FAQ deprecation announcement** (2026-05)
Six years of the Google Search Central blog (2021–2026, approximately 211 articles): **Page Experience launch** (mobile in May 2021, desktop in Q1 2022) + detailed Core Web Vitals coverage / **Helpful Content Update** (August 25, 2022; merged into the core algorithm in March 2024) / **Product reviews updates** series (April 2021 / December 2021, etc.) / **link spam updates** (July 2021 / December 2022) / **site reputation abuse** (March 2024 / November 2024) / **AI-generated content guidance** (February 2023) / **Helpful Content merged into the core ranking system** (March 2024) / **INP added to Core Web Vitals** (May 2023) / **August 2024 core update** / **AI Overviews / AI Mode** (2024–2025) / **June 2025 simplifying search results** (large-scale cleanup of structured data types) / **Crawling December 2024 series** (4 educational articles) / **Robots Refresher 2025 series** / **back button hijacking spam policy** (April 2026) / **FAQ deprecation announcement** (May 2026)
A thematic distillation of 23 Google Search Central blog announcements covering core updates, spam updates, product reviews, and page experience. Google’s own official explanation of how its algorithms have evolved.
A thematic distillation of 38 Google Search Central blog posts covering Googlebot user agents / JavaScript SEO / the mobile-first transition / Page Experience / Core Web Vitals / the rise and fall of AMP / and Crawl Budget.
A thematic distillation of 20 Google Search Central blog posts covering quality policies, E-E-A-T, Helpful Content, the Quality Rater Guidelines, and deceptive behavior policies.
A thematic distillation of 15 Google Search Central blog posts covering robots.txt standardization, sitemap best practices, canonical errors, hreflang in practice, and the Indexing API.
A thematic distillation of 26 Google Search Central blog posts covering site reputation abuse, scaled content, expired domains, link spam, hacked sites, manual actions, and disavow.
A thematic distillation of 18 Google Search Central blog posts covering Google's stance on AI content, RankBrain, BERT, MUM, the Knowledge Graph, AI Overviews, and Succeeding in AI Search.
Three major categories of Google Search Central announcements: (1) Three major event series under Events — Search Central Live (flagship, global, free, 35 cities in 12 languages) + Deep Dive (multi-day in-depth edition) + Unconference (since 2020, user-proposed sessions, 500+ participants); (2) Detailed table of 100+ events in the 2022–2026 Events calendar; (3) Four-year timeline of Latest documentation updates — major changes in 2022/2023/2024/2025/2026: FAQ deprecation in 2026-05 / practice problem removal in 2026-01 / AVIF support in 2024-08 / AI Mode/Overviews counted in SC in 2024-08 / SD simplification in 2025-06 / mobile-first completion in 2024-07 / etc.
5 major sections of Google Search help layer operations: (1) 6-piece Debugging tools set + ngrok tunnel to traverse firewalls; (2) Status Dashboard with 4 statuses + 5 years of history + RSS+JSON API; (3) DMA business user eligibility + appeals process (EEA); (4) European Search Dataset Licensing Program (applications open from 2024-03-07, data available from 2024-04-01, 6 eligibility criteria); (5) 3 forms for reporting spam / phishing / malware + privacy rules
Search Console basics, 5 core reports, Looker Studio dashboard (GSC + GA4 side by side), 7-step traffic drop diagnostic method, 4-quadrant bubble chart analysis, Google Trends keyword research and seasonality, and 8 reasons for discrepancies between GSC and GA. The complete tool stack for SEO data analysis.
Listen: 01:57–06:39 and 18:48–19:43. Yu lists doctors, lawyers, engineers specializing in particular languages, and people combining unusual disciplines or languages. A model company may know something is wrong without knowing how to evaluate medical or legal answers systematically. It needs judgment as well as labor.
Juntao joined OpusClip in 2023 and worked on payments, commercialization and growth products. Edited from a live presentation and questions, the episode covers acquisition, conversion, retention and insight. Its central idea is to make growth actions opportunities to understand users, beyond finding another traffic source.
Integration of 3 perspectives on overseas promotion + matrix-based operations. Wang Kai (226 posts of go-global practical experience + 6-platform SOP + multi-browser matrix v1.1 + 4-layer isolation infrastructure) / Lao Huang (newtype.pro overseas independent products + individual business experience + 3 things for 2026 + Pro User multi-tool stack) / Lao D (rap.dev domestic one-click publishing + adaptation for use in mainland China without scientific internet access). Covers the divergence between going global vs staying domestic, matrix scale of 50 channels vs intensive cultivation of 1–5 platforms, recommendation traffic vs SEO, and overseas infrastructure checklist.
Lao Zhang of Ai Xuexi, 2026-05-16, single long-form deep dive. X platform For You recommendation system open-source update on May 15 (Phoenix / Grox / Hydrators / Ads Blender) → 7 actionable checklist items for creators. Answers "Why does my title look punchy but my traffic is terrible", "What scores exactly does the recommendation system assign", and "How many content goals should image-and-text creators break their work into". Technical teardown perspective, adding the 6th perspective beyond the 5 author perspectives in wiki-ai-self-media-engineering.
Google Discover appearance mechanism (no special tag, based on interest + helpful content + large image 1200px+ + max-image-preview:large) + traffic is inherently unpredictable. Image SEO (use `<img src>` not CSS / image sitemap / descriptive filename + alt / og:image / primaryImageOfPage SD / SafeSearch / opt-out inline). Video SEO (must have watch page index + dedicated page for single video + Key Moments Clip/SeekToAction SD + Live Badge + allow fetching video files). Core Web Vitals 3 metrics (LCP <2.5s / INP <200ms / CLS <0.1) + Page Experience 6-dimension self-assessment. Avoid intrusive interstitials (use banner instead of modal / let Googlebot bypass mandatory interstitials). Signed Exchange (prefetch speeds up LCP + Web Packager). Site names (WebSite SD + alternateName + domain level). Web Stories (must be valid AMP + 4 required metadata + self-referential canonical + 5 content policies 280 characters / video-first). Flexible Sampling (metering 6-10 articles/month + lead-in shows first few sentences + paywall SD prevents cloaking). Package tracking (India/Japan/Brazil + 700ms API). Byline date (prominently visible + datePublished/dateModified SD). Top Places List (curated, not sponsored). Reviews system (11 languages + evaluates first-party reviews + site-level evaluation if volume is large).
Full overview of Safe Browsing + Security Issues report. Strict definitions of Malware vs Unwanted Software + 5 major behavioral prohibitions. 4-step fix for Social Engineering (phishing/deceptive ads/unclearly labeled third parties) + screenshots of 3 typical violations. Full-role checklist for preventing malware. Repeat Offender 30-day no-appeal policy. 7 major methods to prevent UGC spam (reputation / noindex for new users / nofollow+ugc / manual review / blocklist / reCAPTCHA / monitoring). Usage of 4 major search operators (site/filetype/imagesize/src) + limitations (inaccurate; prioritize URL Inspection for debugging). Removals tool: temporary removals for ~6 months vs permanent removal via page deletion/password protection/noindex. 5 major sources of redacted information leaks (cropping illusions/OCR/document history/metadata/URL filenames) + 5-step remediation after improper redaction.
A collection of 74 Shensi Circle case articles tagged with keywords "ethnic Chinese/China/going global". It covers model cases of ethnic Chinese founders: Readdy.ai, Lanhu, MasterGo (5 million ARR in 4 months) / customer service company valued at 1.5 billion (200 million in funding) / recruitment company with 20 million (in an era where applications surged 3x) / designer-turned-algorithm indie developer on the MIT path / AI company employee + mother of two (Pretext, 21 million views) / Stanford Chinese dropout / Berkeley Chinese (AI marketing automation, 28 million) / former frontline Google and Meta AI scientist, 43.5 million / former Amazon executive, 15 million / Cambridge PhD, 5.35 million, AI parallel world / 22-year-old MIT Chinese dropout, 21 million / Manus going global / Linkloud Global NEXT 2026 Going Global Conference
