Thank you both.
Which one of those has the lowest fees? (sometimes it is hard to find since they have a "hidden" fee with a crappy exchange rate)

use this site to know withdrawal fees https://withdrawalfees.com/coins/litecoin , most of CEXs dont ask for deposit fees There are rarely any hidden fees.

There are a few sites that can help you swap BTC Lightning for LTC

1. Robotsats - http://robosats6tkf3eva7x2voqso3a5wcorsnw34jveyxfqi2fu7oyheasid.onion/
2. Sideshift - https://sideshift.ai (But they could ask for KYC at any time, though not always)
3. Coinswap - https://coinswap.click/
4. Boltz exchange - https://boltz.exchange/ (Only possible to exchange BTC LN and BTC)

If OKX is option then it is the best, they ask for $0.09 (0.001 LTC) fees with $0.93 (0.01 LTC) min withdrawal amount.