Picoctf is good, it has the picogym where you can play previous years challenges, this years competition has just opened for registration and runs next month.

Tryhackme has a good intro section to get you used to different tools and areas of hacking.

Bandit at overthewire is a really good game for beginners, and they have a suggested order to complete the other games they have to ease you into it.

Hackthebox is good, they have a challenge you have to complete to gain entry but they have different difficulties of machines once you join.