On Schedule C car and truck expenses, if I used my car to transport the materials, do i check "Use for Hire" Yes or No. I don't understand whaat it means

Take a look at this previous thread.  Hopefully, it answers your question.

https://ttlc.intuit.com/community/investments-and-rental-properties/discussion/what-does-use-for-hire-mean/00/757542

No, you did not use your vehicle for hire. This applies to taxi and rideshare services.