These are optional tasks that will give you useful rewards if you manage to complete them. They are divided to five tabs. Event tabs require specific event SSR characters to be completed so don’t fret if you can’t complete it.
You should always aim to complete at least the Daily and Weekly tasks. These provide valuable resources like Gold, Evolvemons, Enhance Stones, and the like. While doing these daily and weekly tasks, consider completing the monthly ones as well since they provide even more better rewards.
Finally, don’t mind the Challenges tab since it’s meant to be completed in the long run. Just play the game normally and you’ll clear the tasks listed there without you noticing it.