The autocomplete attribute in HTML is actually super powerful
I always thought for some reason that this attribute only allows vendors to propose clever autocompletion in their keyboard interface.
Just today I learned that it can actually also autocomplete things like one-time-password or contact details besides your name and e-mail.

Don't use HTML title on images
When adding images, many CMS tools offer fields for both HTML alt and title attributes. While the former is still super important for accessible images, the latter should no longer be used. Titles might have been useful in the pure-desktop era, but they do not work with touch devices and even cause some screen readers to read both.

Don't say it's an image
When adding HTML alt attributes for images, don't start with phrases like "Image of" or "Photo of". Screen readers already do that by default.