When you enter Moodle the page you see is called "My Moodle", which you can customize yourself. Everybody will see a personal page containing the names of the courses they give and the courses they take.
To personalize this page:
IMPORTANT NOTE: Only you will see these blocks, not your students. If you want to add blocks to a course for your students to see them, first you need to enter that course and repeat the steps here.
You can change the position of the blocks by using the arrows you see at the top of each block.