Guides
Schema Markup: Structured Data Without Spam
Choose accurate schema types, generate JSON-LD from real source data, connect entities with stable IDs, test edge cases,...
Guides
Step-by-step guides, templates and best practices for SEO and marketing.
Advertisement
Guides
Social Preview Checker: Preview Your Facebook & Zalo Share
Why your shared links look unprofessional, what Open Graph and Twitter Card are, the right image size, and how to previe...
Guides
Image SEO and Alt Text: Optimize the Whole Workflow
Optimize images from alt text, filenames and responsive delivery through lazy loading, structured metadata, image sitema...
Guides
Title Tag Checker: How to Check Your Title Tags for SEO
What a title tag is, the ideal 10–60 character length, common mistakes, and how to check title tags for free to improve...
Guides
Meta Description Checker: How to Check & Fix Your Meta Descriptions
What a meta description is, the ideal 50–160 character length, common mistakes, and how to check meta descriptions for f...
Guides
12 Best Free SEO Checking Tools for 2026
A practical roundup of 12 free ClickSentinel tools: SEO Checker, deep audit, meta, speed, robots.txt, sitemap, IP, redir...
Guides
Hreflang: A Practical Guide to Multilingual SEO
Implement hreflang for VI/EN websites with correct language codes, x-default, return links, canonicals, sitemaps, and tr...
Guides
Quality Score 0–100: How Traffic Quality Scoring Works
Learn how traffic quality scoring works from 0–100: IP intelligence, duplicates, velocity and behavior — and how to read...
Guides
SEO-Friendly Meta Titles & Descriptions (With Templates)
How to write SEO-friendly meta titles and descriptions with ready-to-use templates to boost Google CTR without ranking h...