your question is very unclear!
when you mine you get paid in a cryptocurrency. for example you get satoshi if you mined bitcoin, doge if dogecoin, eth if you mine ethereum and so on.
then you have to decide if you want to keep the reward or not. you can consider it as an investment if you think what you mine will go up in price. then hold it and sell when it is worth more.
with bitcoin, you can also use it to buy stuff, exactly like how you use money to buy stuff online.