Starting F1 and H1

Should these courses be done along with a weight lifting routine or should they be done by themselves?

By themselves.

Thanks man

One by one or I can combine them?I mean for instance F3 with Handstand one?

Simply progress to the next level once you have demonstrated mastery. In the example by Erhardt, yes F3+H1 can be combined if you master F2. There are several templates available for how to practically combined the foundation and handstand work. For example, you can have practice handstand after foundation or on a separate day. Here is the course curriculum:

https://www.gymnasticbodies.com/forum/topic/12862-the-gymnasticbodies-roadmap-and-curriculum/