When sats in a lightning channel are sent to another address, every node that forwards the payment recieves the routing fee that the node has set. The lower the routing fee, the better the chance of getting someone to route through you.

If your payment requires 2 or 3 nodes, then those 2 to 3 nodes get their fees, but your channel is direct with the node you're paying, you pay no fees at all.

I hope this answers your question