2. How do I circumvent high fees?
I use Altcoins where I can and if I must use BTC, I pay the amount for 18 Sat/VB and use ViaBTC to accelerate the transaction for free.
I wanted to suggest set the fee low but to meet the requirements of the viabtc service for free transfer but right now that’s not possible because the hourly slot for free service is said to have been hijacked by bots and it will be hard to get a transaction accelerated using Viabtc free service.
speaking for myself.
i don't know how to use securely.
does bitcoin core supports it?
what opening a channel means?
do i need to have another wallet?
what means paying an invoice? (seen it from kraken, which allows withdrawal via LN).
This is simply saying you don’t have knowledge about LN. here is a
comprehensive list of threads for LN network by Pmalek
Also this is how to set up a LN using electrum wallet
https://bitcointalk.org/index.php?topic=5259973.0