Hussey, M., Copeland, T. and Phillips, D. (2022). What is the Lightning Network? Bitcoin’s Scalability Solution. Decrypt.co.
The following videos are a bit technical.
Bitcoin’s Lightning Network, Simply Explained! (2017) [5:33]
Bitcoin Lightning Network Explained: How it Actually Works (2021) [21:16]
Lightning Series: Mastering Lightning with Andreas M. Antonopoulos & René Pickhardt (2021) [1:10:43]