What project management tool do you use, if you have to work on multiple customers/projects or if you want to keep track of the tasks you need to do?
Trello! 
ClickUp.
2 Likes
Github Projects for past year or so. Works well with Git commits and teams.
There are certain quirks, and does not have the huge feature-set ClickUp has, but is enough for us for now.
We were using Github issues and Notion (or whatever else client wanted) in the past, but with Projects, its become much easier to manage things.
click up is great, espically if you have more than just 'code' projects going on.