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Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.
It's pretty annoying to see the same toot repeatedly on #Mastodon because everyone is boosting it, even if it's legitimately awesome.
Currently, a boost of a toot is only posted if at least 40 other toots have been posted since the previous boost of the same toot.
There is a GitHub issue asking to allow the user to change this number, or set a duration instead:
https://github.com/mastodon/mastodon/issues/18693
Please vote!
Navigation doesn’t have to be hidden behind a "Menu"-button. If it matters, we need to show it, and do so prominently. Some items are more important or more frequently used, so they might deserve a little bit more spotlight in your navigation.
In addition to prominent navigation options @vitalyf shows in his thread, I really like the horizontal overflow scrolling navigation, enhanced with @LeaVerou's scrolling shadows.
Do we really need to repeat that using an icons font is a bad idea?
This is #Mastodon UI right now:
Fonts are not loaded because of an error (from a Service Worker?):
Very welcoming for new Mastodon users… 😔
A Designer’s Guide to Documenting Accessibility & User Interactions
A lot of sites were not designed and developed with accessibility needs in mind. As designers, a lot of us think that “accessibility is the job of the developer team”. Accessibility becomes an afterthought for a lot of projects. Companies launch inaccessible tools, sites, services.
Jenni Nadler
When life gives you lemons, write better error messages
Wix reviewed and fixed 7,643 error messages that were “generic” or “not helpful”, and Jenni explains how to provide better assistance to users:
Jakob Nielsen 
Stéphanie Walter