If you want to join multiple groups automatically then you would like to have a automation script or tool which can does this stuff for you. Here this post is exactly doing what you required by using datakund automation library. Below are the coding steps to move on:-
- Install datakund
pip install datakund
2. Import datakund and login to linkedin. You can see here to login with cookies.
3. Now join the group by calling a simple function join_group by passing the group link