What are some best practices for using alt tags and other image descriptions to make my website more accessible?

Here are some best practices for using alt tags and other image descriptions to make your website more accessible:

1. Use descriptive alt text: When adding an alt attribute to an image, use descriptive text that conveys the meaning of the image. Avoid using generic or vague descriptions like "image" or "picture." For example, instead of "image of a car," use "red sports car driving on a mountain road."
2. Include important information: If an image contains important information not conveyed elsewhere on the page, ensure to include that information in the alt text. This could include data charts, diagrams, or infographics.
3. Use appropriate punctuation: Use appropriate punctuation, such as commas, periods, and semicolons, to separate different elements in the alt text. This will help assistive technologies to read the alt text more accurately.
4. Avoid using irrelevant text: Do not use alt text to describe irrelevant elements, such as decorative images or images that are already described in the surrounding text. Decorative images can be marked with a null alt attribute, while images that are already described can be given a brief alt text.
5. Consider using longdesc attribute: For complex images requiring a more detailed description, consider using the longdesc attribute to link to a separate page containing a longer image description.
6. Use descriptive file names: Use descriptive file names for your images that convey the image's meaning. Avoid using generic names like "image1.jpg" or "photo.jpg."