It was implemented to solve the challenge of scalability, this helps the transactions go more bigger and faster, you already have some helpful threads to go through as recommended by some members about lightning network, it is more attractive for you to find them interesting for reading if you can give the required time in making the discoveries about why it was being introduced.

You can also find this an interesting article to read from what the forum members have to say concerning LN for learning purpose.

bitcoin lightning network
https://bitcointalk.org/index.php?topic=5202798.0