A tool that I have seen a lot and as a popular option is the use of Mixers (also known as tumblers) that allow transactions to be mixed and masked, making it difficult to track the origin and destination of funds.
Nothing guarantees anonymity in Bitcoin, meaning there is always a risk and using a mixer service we have to trust someone because a mixer service has an owner who runs it.
In certain processes, working offline and using tools such as Tor to hide a computer's IP address are efforts to maintain a level of privacy.
Study again what I said, don't be mistaken.