These all depend on how much content you have for each project. If you can write something up, awesome, but consider showcasing only your top shelf work. That way you don't dry yourself up trying to come up with words for projects you're no longer that involved. Use this opportunity to define a case study process for your portfolio, that way you start archiving your thought process for future reference.
As many projects as you'd like as long as they're all the same top quality.
Thought process(case study), design experience (typography, design systems, etc), methodologies, and tech/skill stack.
These all depend on how much content you have for each project. If you can write something up, awesome, but consider showcasing only your top shelf work. That way you don't dry yourself up trying to come up with words for projects you're no longer that involved. Use this opportunity to define a case study process for your portfolio, that way you start archiving your thought process for future reference.
As many projects as you'd like as long as they're all the same top quality.
Thought process(case study), design experience (typography, design systems, etc), methodologies, and tech/skill stack.
Depends