If you're new to sim racing, here are some great online tutorials about how to improve your racing:
SAFE is FAST
TurnFast.com
iRacing Racing School YouTube playlist
https://speedsecrets.com/driving-tips-2/ (Ross Bentley's site)
"Ultimate Speed Secrets: The Complete Guide to High-Performance and Race Driving" by Ross Bentley
Race Logic ebook: Advanced Circuit Driving Techniques
Check out this thread from the PCARS 1 forums for even more tutorials.