Coinbase is a San Francisco-based cryptocurrency exchange. The company is one of the most established crypto exchanges and its products are fairly easy to use in general. The only problem I have with this company is that their customer service is quite slow. To be fair, this is a common problem among exchanges, so it should not be a reason not to use them, but I guess they still have a lot of room for improvement in this particular area. Now that the company has gone public, I expect some things to improve, but overall I've never had any issues with Coinbase, I still believe is one of the safest places to buy and sell crypto