Logging In is very easy and simple process in Gmail. Plus, it also lets you stay signed in for long without being logged out. It is completely fine if you have signed from your own device but if you have used any public computer system then it can be dangerous and might create a problem for you as anyone can have your account's access.
"Android for your PC. An Open Source OS, based on Android, that incorporates many optimizations, features, and expanded device support. And it is available for just about any Chromebook, Windows/Linux PC or tablet released in the last 4 years"