Re: Just lost $4000 because of addresses starting with "bc1p"
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Address types:- Legacy: start with 1
- Nested Segwit: start with 3
- Native Segwit (also called as Bech32): start with bc1q
- Taproot (also called as Bech32m, a variant of Bech32): start with bc1p
Address starts with 3 can represent various things though, such as multi-signature address or any custom spending condition.
Thanks a lot whoever thought it was a good idea to have "bc1p" on every address. 
Check BIP 173.