You can easily use one of Monero clients below. It would be a great decision, especially if it’s the first time you are about to use Monero. You may also find clients very convenient if you use a device that cannot run a full Monero node.
All of the clients below are confirmed by Monero official community and can be used undoubtedly.
My Monero
It can be used with some measure of safety, as MyMonero are unable to spend your funds on your behalf.
It is owned and operated by Riccardo Spagni, one of the Monero Core Team members.
Full Monero client
Monero core software can be downloaded from the downloads page.
lightWallet

lightWallet is a simple and slim client written in Python, and should run on most operating systems. It is written and maintained by jwinterm.
Current Version: 0.0.2-alpha
MoneroX GUI

MoneroX is a GUI for Monero written in .NET and available for Windows, and soon for Mac and Linux. It is written and maintained by Jojatekok.
Current Version: 0.41.1