Recommendation letter are a necessary evil in academia so I will write one for you if :

You took a class with me or TA'ed/ULA'ed for a class with me
Your Final Letter Grade in that class was A- or A. If it was B+ or B, I would still write it if you have a good reason for that score.
You have contributed well to the teamwork, participated in discussions and also helped out your fellow classmates
To increases your chances of a better recommendation letter, make sure you participate in all class activities and ask for a recommendation letter early enough i.e. at least a month in advance if not 3

You have an academic misconduct or behavioral misconduct report.
You did something unsavory like being arrogant in your responses to your classmates or TAs on the discussion board or Teams/Slack, even if you were not reported.

Name of the programs you are applying to and their respective deadlines
Your Final Letter grade in all the courses you took with me and the terms that you took them with me
Something noteworthy about your Portfolio project or the course work – e.g. extending the Portfolio project beyond classroom. If you can't recall that, it's ok to just send me a link to your project on GitHub so that I can take a look.
Any specific mention-worthy interactions with students from your work as a ULA/TA and/or as a student
Anything else you would want me to talk about!

All the above applies, but if you haven't been a TA/ULA for me, my word would usually not carry much weight even if you had an A in my class. So you should first contact the Prof whom you have worked with a TA/ULA :)