When your write or read the code, sometimes you need to jump from file to file more times.
Everytime you spent a lot of time to find the line that you leave just a minute ago.
With the Visual Studio bookmark you resolve this problem.
To insert a bookmark, press Ctrl+K, Ctrl+K.
For navigation, press Ctrl+K, Ctrl+N to navigate to the next bookmark,Ctrl+K, CTRL+P for the previous bookmark.
It's easy, but it's useful to save time. 