Touching the net, the posts or the other side
If you, your racket or anything you wear touches the net, a post, the cable or the other pair's court while the ball is in play, your pair loses the point. Jumping over the net loses it too.
The net and posts
While the ball is in play, no part of you, your clothes or your racket may touch the net, the net posts or the tension cable. If it does, your pair loses the point, even if your shot was a winner.
The other side
You may not touch the other pair's court, and jumping over the net loses the point. After a ball has bounced in their court and spun back to yours, they may reach over to play it, as long as they touch nothing on your side.
Your own walls
Brushing or leaning on the glass on your side is fine.
Questions
Can you touch the net in padel?
No. Touching the net, posts or cable while the ball is in play loses the point.