If you're no longer using an app frequently, you can unpin it from the taskbar. While the app will be removed from the taskbar, it will not be removed from your computer. It will be available in the Start menu instead of on the taskbar.
The taskbar includes system icons near the clock. View your battery status, network connection, notifications, etc. by clicking these icons. Like other Windows icons, you can customize what appears in this part of your screen.