How do I start in crypto currency

It depends on you actually, and also did you know that you can actually mine some coins only through browser instead of downloaded software. It is your choice. You can start mining by register yourself at Coinimp (for Monero currency) website which their services let you mine coins through browser only.
Note: Mining coins on your browser only uses CPU power unlike downloaded software.

Find yourself some trusted online wallet which can hold your coins, and of course there are some sites can only hold certain currency like My Monero Wallet which is for Monery currency.