As you continue to work with Vim, you will find yourself making a lot of configuration changes. It's important to take time to go back, reflect, and make sure your .vimrc doesn't become a pile of unneeded aliases, functions, and plugins.
Once in a while, take the time to go back into your .vimrc and clean up unnecessary functions and plugins, or remove key bindings you don't use any more. If you don't know what something does, you're probably better off deleting it, since you won't get much use out of configurations you don't understand.
It's also helpful to take some time to read about the options you have set and plugins you have installed with the built-in :help command—you'll never know what useful feature you'll discover!