The following cars and tracks are included with your iRacing membership! These cars and tracks will make up the early stages of your racing career:
https://www.iracing.com/tracks/
Click the filter to list only "Included with Membership" content 
Additional cars and tracks are available to license as you progress through your racing career. You may test, host, or race against *AI with any content that came with your subscription or that you have licensed.
*At this time, AI does not include all content. Find more details on AI ready content here:
Participating in official iRacing series requires the appropriate license level, which can be earned by meeting minimum participation requirements and achieving the required Safety Rating. Full details are available in the iRacing Sporting Code and this FAQ.
Make sure to check out our Refer-A-Friend, Race Participation, and Volume Discounts that we offer!
You can earn iRacing credits that can be applied towards iRacing subscription renewals, content and hosted sessions! More information can be found here: Rewards