How to disable annoying notifications in Android

Smartphone notifications are pretty useful, there's no denying that. They make it hard to miss an important event, such as an upcoming appointment in one's calendar or the arrival of a new email in their priority inbox. But when abused, notifications can be quite annoying. Android users would surely agree with that – it is a common practice among developers to have their games pushing notifications reminding the user that they have skipped a day without playing or that they're about to miss on an in-app purchase discount. You know, stuff that nobody really cares about. Thankfully, disabling these annoying Android notifications is an easy job, requiring no hacking whatsoever.