1.Existential Deposit and Keep-Alive Checks - https://www.youtube.com/watch?v=WRKJ1onoWqA
2.Using Polkadot with Ledger Live - https://www.youtube.com/watch?v=-8FMffJJPEQ&t=130s
3.How to Switch Nodes on Polkadot.js Apps - https://www.youtube.com/watch?v=hQf8A3IXmrc
4.A Beginner's Introduction to Parachain Slot Auctions - https://www.youtube.com/watch?v=3Kcqkm-43E4