There are many posts already created for this topic. Have you tried searching the keywords "safe bedding" and "safe litter" in the forum search(tick the box of titles only if you need extra specific)?
Although it is more of a hassle than having people just dump their reccommendations here, questions about safe bedding are pretty common so you can easily find the answers if you go through some of the posts that already have people's replies.
Unless it's some very unique case like health issues, housing with specific quirks, an extremely difficult bonding or anything like that, we usually tend to look up past posts to stop clogging the forum with the same questions all over again.
Just the bare bones minimum:
Equine bedding, newspaper litter, pelleted litters are all pretty much fine. You do best staying away from shavings for their mess and poor absorbent power, untreated pine products and cedar for their chemicals that are bad for sensitive lungs of rabbits.