Just check the ingredients. Anything with Neem in it is probably going to be the safest stuff on the shelf. It's organic, and get one that includes other natural pesticides like pyrethrins. I'm on my first grow, but I garden so I'm just treating it like any other plant. I'm using Spectricide ("Insect and Disease Control") during vegging and early flowering...t's not organic, but I don't care until I get close to harvest. Read the label on the bottle and be sure it treats mites, aphids, powdery mildew, and botrytis, and make sure you use only Neem, pyrethrins, BT, natural things like that, once you're within a month of finishing, since those things are safer to consume than the synthetic compounds.
I don't mean to make this too complicated. Just get a good plant spray that kills bugs and fungus, and when you get near the end of the grow, only use things that say they're safe to use up to day of harves (it will say just that). Get the concentrate (the kind you have to mix with water, not the ready-to-spray bottle), get the right sized sprayer for your grow, spray the tops and the undersides of the leaves, spray before you have problems (don't wait until there's a mite party in your garden), and you will be bug-free.