Well I "believe" that having an understanding of cycling and water chemistry and knowing to choose the proper fish that can handle your water is very important like a 10, you would not want to put a pair of $300 dollar discus into a tank with a high Ph, now as far as lighting, well that depends on do you have plants? and if you do is the tank high tech with co2, if not is it just for the fish appearance? so unless you do no research and just like throwing money away you can get this part going with not near as much research as water chemistry, filters is more about making sure the filters are rated for the size of tank you have, and if you want HOB, canister, or sponge, or well the whole sump/ wet dry thing which would require learning how it works, but would be overkill for a betta tank, but if you had a huge barracks set up then maybe it could be useful, the hard part is learning what works with you water as far as fish and plants go.....believe me on the plants end Peachii and I have tried tons of plants in our water and we have crashed and burned, had some spectacular failures, and some amazing success despite what the databases have said about the plants and what conditions they need, and yes I would say that most of the plant database is maybe 75-80% right and that varies from source to source, sometimes you just need to roll up your sleeves and try things