Second time grower, looking for tips!

Hi!

I grew (with moderate success) 4 plants in my greenhouse last summer/fall and am looking to hit the ground running in April/May for a new and bigger harvest! Didn’t get the results I was looking for with the first grow but it wasn’t bad for the first time ever growing!

For anyone who grows outdoor/in a greenhouse, is there anything you wish you would have known when you started? Or any tips or tricks for growing outdoors/in a greenhouse for SE Ohio?