I realise most of these answers were already given in one way or another, but since i see you're making some mistakes here, i'd like to repeat them and chose my own wording:
I'm new to this bitcoin stuff and that, I'm currently mining in the cloud, since I do not have equipment to mine, asics not much less gpu, I just have pentium 4, 1 gb of video and 2 of ram, practically one Basic pc, I want you to solve me several doubts:
1) You were correct, you cannot mine with a cpu. You might be able to mine some altcoins using your GPU, altough i would seriously doubt you would have invested in a decent GPU if i see the rest of your desktop's stats
2) stop right there, 99% of the cloud mining companies are scams, the rest sells you 100% of the risks for a very small cut in the profits.
1) Best wallet to store different types of coins (doge, dash, btc, litecoins, etc.) currently use yobit
Stop right there (again), stay away from online wallets and exchanges... Go for decent desktop wallets! They general rule is: if you're not the (only) one in controll of your private keys, you're not in controll of your funds... If the exchange/online wallet blocks you, gets hacked, runs away,... you're left with nothing.
2) If I mino another type of currency, an example: I start to mine dogecoins, can be sold directly or have to exchange for btc to then sell them
In my experience, you get the best deal if you look around at all different exchanges exchanging the coins you want to exchange (wow, 3 exchanges in one sentence). Take into account that different exchanges have different fee structures!
3) in the pages that I am currently mining I have the option for btc, dogecoin, dash, etherum, litecoins and even the same GH / S, my question is which is these coins is better to mine or is it preferable to mine a quantity of gh / s To be able to make more coins per hour / day / week / etc
If it's cloud mining, you'd be better off getting the hell out of their system.
4) 6) If I get 'X' amount of any currency, it is better to invest it on the same page or directly take it out to my wallet.
My advice: if you're talking about cloudmining: withdraw as much as you can, don't look back! certainly don't re-invest