Does it mean that I have to learn how to use yet another software?

No at all! SC Project is not like any other software. It is a solution to help you manage your current projects in a more intuitive way. You can think of it as a personal assistant willing to do all the tedious notification tasks for you while you only have to write down a few commands. 

The magic of SC Project is that it works on top of MS Teams, therefore making it more usable and likeable.