How to Buy Bitcoin

So if i have five k and want to buy b t c, where do i buy it and where do i store it? I've heard about these off line wallets, but don't have the full picture. What's the best apeb sate to use? Tonvestan crypto, mght, as well. Tru perry, a dollar cost. Can you clarify that drip is not a rud people take profit,. The protocol works and is still going once the market turn around.