I was having an argument with a friend. He says that you can't be anonymous to the bitcoin's network. Both nodes and wallets use, leads to an ip address where information can be found.
I had read in this forum that you can hide it with hardware? How exactly?
You can't be completely anonymous with bitcoin. Transactions can always be traced ( it is public ledger after all) and there are plenty of companies involved in analyzing transactions histories for exactly this reason.
That being said these chain analysis companies arent perfect and there are plenty of things you could do make tracing your transactions difficult such as the use of coin and transaction mixers(eg coinjoin), never using the same address twice, using tor or the use of dark wallets.
Again all these methods don't guarantee anonymity( most people get deanonymized largely because even they use mixers or tor they often make some mistake along the way) they just make it harder for someone to track you.