Bitcoin buying and storing for a newcomer

I am new to crypto and am only intending to use bitcoin as a savings account of sorts. Just wondering what people use nowadays to purchase. Coinbase? And where do you store it? Is Coinbase secure so should I store it elsewhere? Also is there a post about general information about how to sell when the time comes. I know I sound like a complete goober that's because I am, but could you help a brotha out??