Autoflower, huh.
Well, you don't really have many ways to train it.
You can top it after the plan starts throwing fives,but don't top it if a month or more has gone by since it popped out of the seed.
You can low-stress train and defoliate to get more bud sites.
Figure out your nutrients. Do some research and find the nutrient packs that work the best with how you grow.
Always research the cultivar(strain) you are growing. Different genotypes demand different things. Some eat a lot more than others. Some prefer a higher temperature or humidity. Some aren't that hardy and can get powdery mildew or mold quite easily.
Dial in your light distance, VPD, EC, temperature, etc., and you'll be on your way to optimizing your grows and having all the important stuff dialed in.