Create a web wallet for online use. If you plan on using your Bitcoin primarily for online purchases, a web wallet is likely the best choice for you. They are convenient and easy to use, so you don't need to be particularly tech-savvy.
A web wallet works like any other online account. You simply register, transfer your Bitcoin, and then log on to manage your wallet.
Because of the security risks with web wallets, it's much better to go with a hybrid wallet, such as Copay, that can be used across multiple devices and provides additional layers of security not found on basic web wallets.