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How to check a website, investigate errors and track changes.
Page 24
A plain-language look at CORS: preflight requests, Access-Control-* headers, common backend configuration errors, and configuration examples for Nginx and Express.
What a crawl budget is, how search bots allocate resources to crawl a site, and why duplicate pages, parameters, and low-value pages hinder the indexing of important content.
What scaled content abuse and doorway pages are, why Google and Yandex remove thousands of auto-generated pages from their indexes, and how to find and fix the problem using a real example.
We explain the llms.txt format: why it was created, how it differs from robots.txt and sitemap.xml, who already uses it, and whether it is worth implementing right now.
We explain Yandex’s Site Quality Index: which factors really affect the SQI, why link manipulation no longer works, and what to do to improve the metric honestly.
How to create a status page for customers—transparency, trust, and automatic uptime monitoring. A guide to setting one up on reChecker.
A complete guide to barcode formats: EAN-13 for products, Code128 for logistics, Code39 for industry. Online generation and validation.
A guide to monitoring brand mentions in the news. Google News, setting up alerts, sentiment analysis, and PR strategy.
Choose a color online and get its HEX, RGB, or HSL code. Learn the differences between formats, WCAG contrast, and how to create palettes.
What content gap analysis is, how to find topics covered by competitors but not by you, and how to use this data to grow organic traffic.
Open a tool for the task described in the article.