I'm a complete beginner gardener. What plant nutrient solution should I use? When and what, how much to use? How many seedlings can I store per square meter? If you are familiar with a video, a page where it is presented in detail. What kind of pruning and stressing should I use?
If you're going with autos they dont need much in the way of nutrition, simple water will be fine.
That said I've used a triple combo of biobizz nuits = bio grow, bio bloom, & bio topmax on my autos with no harm.