You need to know the rules of golf well to legally use them to your advantage legally. This is where TheGolfExpert can help you.
Taking free relief
Rule 25 - A player may take relief from a burrowing animal hole or runway from such animal including birds and reptiles.
Rule 20 - A player may take warranted relief (casual water, ground under repair, cart path, etc) - even if this means the relief would also provide the player relief from another obstacle (such as a tree).
Rule 25 - In regards to ground under repair, a player can get relief even if not marked. For example a hole made by a greens keeper or material piled for removal.