Lessons
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Introduction
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SEO
- Snippet's clickability in search engines
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Indexing
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Headings H1-H6
Images have the "alt" attribute.
The Title attribute of links
Content robots.txt
Duplicate "title"
Duplicate "description"
Human-understandable name of the picture
Rules for formatting text on a page
Micro-markup format requirements and recommendations
Validation microdata Google
Human-friendly link format
Errors in Robots.txt
The content of the site map
The site map file
Link formatting requirements
Hreflang tag
"canonical" tag
Spelling of interactive interface elements
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Speed
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Reduce the number of network requests
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An overabundance of small pictures
Grouping CSS files
Grouping JavaScript files
An overabundance of font files
Redirects when uploading files
Availability of end-to-end CSS, JS files
Uploading duplicate files
Using JavaScript facades
Redirecting JavaScript code
Redirect from/to www version
Using sprite technology
The video player is connected correctly
- General assessment
- Configure the server
- Speed up the display of the first content
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Reduce the size of graphic files
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Minification of the embedded JavaScript code of the page
Minification of the embedded CSS code of the page
Minification of images without loss of quality
The total size of all images on the page
Font Optimization
An overabundance of monochrome icons
The presence of a monochrome font
Data optimization:Image URLs
Animated image format MP4, WEBM, SVG instead of GIF and WEBP
Cropping monophonic fields in images
Using the WebP format in images
Too high-quality images without using compression
Suitable video bitrate
Excessively large images
- Server performance
- Fix the locks
- Reduce the amount of code
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Reduce the number of network requests
- Mobile adaptation
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Software errors
- Code
- Mail operation
- Availability
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Server Settings
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Configuring HTTP Headers
Erroneous extension of images
Corrupted files
Matching the Mime Type to the file
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Convenience
- Text readability
- Interface
- Visual defects
- Interaction with other programs
- Image Favicon
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Vulnerabilities
- Code
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Server Settings
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Uploading all page files via HTTPS
Strict-https header for increased security
Private access to service files
Encrypted IPv6 connection
Enabled error display in the north
SSL certificate validity
HTTPS Availability
Redirects to protected
Vulnerabilities of a secure SSL connection
HTTP headers for increased security
- Third-party services
Matching the Mime Type to the file
For each file on the server, the HTTP Content-Type header specifies the mime type file. Even the web page itself is of the text/html type. Each image format, CSS, JavaScript, XML files - any file has its own mime type.
By default, web servers specify the mime type based on the file extension. For png this is image/png, for pdf - application/pdf, etc. But sometimes, due to incorrect server settings or specific usage scenarios, the mime type value may be incorrect.
Errors in mime type rarely lead to serious problems, since browsers are able to automatically determine the file format by its contents. But if an erroneous mime type still causes a problem, then it is very specific and difficult to reproduce. Programmers will spend a lot of time before they realize that the problem is an incorrect mime type. Therefore, configure these values on your server.