Thank you for this information. I had to bookmark it because my brain was overheating trying to grasp these new concepts.
No problem
Keep in mind that a good camera setup doesent automagically make good pictures and there is tons to learn about photography if you want to take professional looking pics with DSLR setup. You can get decent pics from watching a few tutorials, but mastering the use of light is something that takes a bit longer and looking at some pro photos, it might not be apparent how much work goes into those pictures and setting of lights etc if you really want to take superb photos. That sort of ring flash thing is good for getting an even light, but smetimes you might want to use hard light from behind also and take that front light to a side slightly. So you might need more than one light source. But you can also do some tricks like take the photo in pitch darkness with long exposure time, camera on stand and flash one flash multiple times from different directions. But if you try to get every light just right, its not that easy doing it that way. You can also paint with light using long exposure in dark and a flash light. It can give a pretty nice effect.
I dont want to scare you away Its a nice hobby, but if you just want to take ok shots for documentation and not try to be an artist, well you can see from my last post what some age old cheap as shit point & shoot camera can do with macros. I bet you could get much better results if you spent even like 60 dollars wisely to a point & shoot. Point & shoot cameras are also much easier to use and dont have the same learning curve, but you also dont get as good results. But is good results worth a new hobby and spending a few hundred on it? Well it just might be! Also if you buy this stuff used and dont overpay, you can resell for same price or even perhaps for a little profit, in case you decide that you want to buy something else instead. Its ofc a hassle and an investment, but you dont really lose anything, unless you overpay.
I recommend watching some tutorials on youtube about product photography and macro photography