One important travel tip to know before visiting Bali is that the water is not safe to drink or use for brushing your teeth. Bottled water or filtered water is recommended.
Another thing to know before visiting Bali is that you will encounter stay dogs, monkeys, and other wildlife. Keep a safe distance to avoid getting bit.
Another travel tips to know in Bali is that tipping is not expected at all. In fact, it is not a part of the culture. Instead, leave good reviews for them.
Bali is a somewhat conservative place, especially at religious sites. Bring some long pants/skirts to cover knees. They will provide sarongs if needed.