Wanted to ask your opinion about which lense I should buy. I must say that I'm amateur and if you could explain your choice, that would be greate.
Check the pic
If you're going to buy a 24-105 f/4, buy the Sigma.
The Canon only makes economic sense as a kit lens.
Personally I would get a 24-70 and just crop if I needed 105.
70mm at f/2.8 with a 1.5x crop becomes 105mm at f/4.2
Get a fast prime. 35mm f2 will do you nicely, or get the 50mm f1.4 if you have fool frame. Learning with zooms makes you lazy. Plus if you have a crop body an "all purpose" lens that only goes as wide as 40mm is pretty dumb
I use micro four thirds but I only ever carry around a 35mm equivalent on the front of my camera and stick a 90mm equivalent in my pocket. I don't really like 50mm as a focal length, I prefer it a bit wider, but I still think it's the best way to get started.
If I know I'm going to need them (shooting wildlife etc) I bring a 135mm f2.8 and a macro. I have other lenses too that I very rarely use.
I own both, the pictures look about the same
I'd take the 24-70 for the wider aperture but if you don't consider that very valuable def go for the 24-105
if you want a new lens to try something different and you don't have a prime def get the sigma 1.4/35mm or the 1.4/50mm
No worries man. My first lens was actually a manual focus 50mm f1.4. It's a good way to learn and the lens will be cheap. If you aren't comfortable with a prime get some zooms, if you aren't comfortable at that focal length work out why not and do what you can to change it. I actually agree with the Russians and Pentax, 43mm and 58mm feel far more natural than 50, but both are close enough not to make an obscene amount of difference
The enlighten us, if you donknow yourself m8