Some privately owned climbing areas may have restricted access. Check with https://www.ffme.fr/
Park where indicated, take care of the environment, buy the local guidebook when possible (this is one of the ways you can help local route setters), clean up your shoes before climbing, don't spray beta, be polite.
Did you know that you can create an account to record, track and share your climbing ascents? Thousands of climbers are already doing this.