In Windows 10, Task Manager has improved quite a bit when compared to the previous versions of Windows. The task manager has limited detail when you start initially but when clicked for more details contains a wealth of information to do various tasks.
When you open task manager, by default it’s the process tab which is opened. If you are a person who looks at performance tab instead when you open task manager, then you can set that as your default tab or any other tab as default tab within task manager.
In Task Manager, click options
Select Set Default tab and select the tab you want to be the default tab