Beginner's nutes?

[Vexor1717]

Hello, I am growing my 1st set of autos and I am fairly new to growing in general. I am using Air Pots and Happy Frog soil. I would like to know a bloom booster to give them 4 weeks in or so. Like I said, I am still learning and I want to keep it simple. Any other pointers appropriated. Oh indoor tent led btw.
Thanks!