Any strain. The more you learn, the more you'll see a "beginner strain" is a crock of shit. Learn the plant, what it tells you, and how to effectively read it
I've had the easiest runs with white widows. I would recommend those as first runners. Aim for good seed banks Sent from my SM-G930W8 using Tapatalk
White widow x big bud is a good starter strain. Nice yields and takes to training really well plus you'll get a good yield with out as much effort. Always took to ferts really well