There are lots of solutions available online but this is the easiest and simplest one.
Requirements:
1. Activity Launcher
Steps
First Download activity launcher from this link
Or Play Store
Open the app
Now search for this activity
(Search button is available at the top right corner)
Manage apps
Launch the activity and you will get list of all installed apps where you can disable or uninstall most of the system apps(including gapps)
Hope this helps.