In fact, I don't know exactly what a full node is.
A full node starts by downloading ~500 GB. After that, it's ~2 GB per week.
I think the option "blocksonly" does what I want (only download blocks and ignore unconfirmed transaction). I would like to limit the network traffic for the time being.
Unconfirmed transactions (AKA the mempool) are small in size compared to the whole existing blockchain.
The Bitcoin Daemon doesn't do any mining?
Correct. Mining on a computer isn't feasible.