Pretty near impossible to burn. I mean, let's face it- hydro or soil, you can make a mistake and pour something that causes damage. But the humus in the compost and clay, combined with the microbes really buffer things.
People get intimidated by organics partly because of the variety of amendments. Many are redundant. 25 sources of N... who cares, you need 1.
I would forget about vortex brewers, bokashi, Lacto-b, etc. A lot of this is massaging the last 5% of a plant's potential. Stick to the simple, boring core of all of this and you'll hit the 95% no problemo. Then when you're smoking your first full organic nug you can look at some of these other things.
Best advice I could give anyone is get a worm bin. Hands down will get you prize winning anything. Weed or 'maters, worm bins produce stuff better than you can buy. Better than you can buy. I like saying that twice. Made from your household non-meat kitchen waste. Jeepers chrispies, doesn't this just seem to all dovetail perfectly?