Some of the precautions one can take during anal sex is by the use of unflavored condoms for penetration and dental dams for rimming, as the anus has certain bacterias that can cause the spread of infections. It is important to douche your anus before anal sex for hygiene purposes. The anus itself not self lubricating so the use of lube is extremely important for penetration. It is important to go slow and communicate during the process! As a note, always use a different condom when you switch from anal sex to any other form of penetration (oral or vaginal.)
Sources:
https://www.healthline.com/health/healthy-sex/anal-sex-safety#safer-sex-tips