In the Action Center, Microsoft introduced a clever way to view all of your notifications at once, which is one of Windows 10's best features when compared to Windows 7 or 8.1.
However, it is prone to becoming clogged with notifications, including those that appear to be useless (we're looking at you, Windows tips). Fortunately, turning these off is simple.
Go to Settings > System > Notifications & Actions and simply turn off any that are no longer useful or relevant while keeping the ones that are. Third-party app alerts can also be turned off individually.