Guide to mastering S0urce!
Firstly you want to check the tutorial button, as it already shows you the basics. Then you want to begin hacking, I suggest you begin hacking those will the highest number in the target list (It's on the left side of the name tag). This allows you to receive more money, and level up quicker.
Once your'e level 10 or higher, hack anyone, their roughly the same. Remember to buy miners and preferably better miners whenever you can, they'll give you a small income every second.