Best ways of practicing defensive skills?

Hello, all! I would like to hear your opinions on this.

Other than thematic puzzles, what do you think are the best ways of practicing defensive skills? Surely, the answer is different depending on one's rating, but any comments will be useful.

Thanks.

I,d recommend blunder checking all your moves on defence.

Study games of strong defensive players like Tigran Petrosian, Anatoly Karpov or Magnus Carlsen.

If you want the king of defense, enter Tigran Petrosian. (Not to be confused with Tigran V. Petrosian.)

However, be aware that a lot of his games ended in draws due to his overly defensive play. On the other hand, he made it so that other players would definitely know something was up if he started going on the attack.