The session section has all the pages that are important when participating in a Pitwall track session.
The cars page allows you to firstly create cars, and secondly to mount parts to those created cars. These parts are produced after they were developed.
The three other pages are the testing, qualification and race pages. These are the three different types of sessions that there can be. The testing page allows you to test for the grand prix on Sunday or to test in only-testing sessions which last the entire week. The qualification page allows you to qualify for the race. And the race shows the youth race on Monday and Tuesday, and the main race on Sunday.