Suggestions for Simple and Easy-to-Use Tools to Monitor Data & Reports for a CS Newbie

I'm still new to Customer Success and trying to level up my skills in monitoring data and generating reports. I’m looking for recommendations for websites or software tools that are very easy to use and beginner-friendly.

It can be either free or paid (though free is preferred at this stage). My focus is on simplicity and something that doesn’t require advanced technical skills to set up or use.