What are the precautions for lip or nasolabial fold fillers?

I am concerned that my face lacks dimension, making me look older and giving me a flat impression. That is why I am cautiously considering filler injections to add volume. Since this involves injecting foreign substances, I am curious about potential side effects and aftercare instructions before the procedure. I have heard that there are many restrictions on drinking alcohol or exercising after the injection, so I would like to know the exact details. Since becoming beautiful safely is the most important thing, I plan to check everything thoroughly before making a decision. I would appreciate any valuable advice from those who have experience with this procedure.