I have around 700 notes so far.
@tuanan hey, no worries. The Daily note itself does not become a task. I use this to add tasks in it by just writing - [ ] 
But I don’t use the daily notes only to add tasks, but also to save everything important that happened that day, like important e-mails, order confirmation, etc. I use the Quickfind property to indicate if something important is added in that note.
Alternatively you can also use the Tasks command (create or edit task, through the command prompt) if you want to add more stuff like a completion date.
I hope that helps!
p.s. The Tasks plugin is way more extensive and has way more options though. You can even set up notifications if you want.
Notifications - Tasks User Guide - Obsidian Publish