If I have understood correctly, there will be a further hardfork from SegWit to SegWit2x in November.
At the moment a Bitcoin can have three types of addresses:
1. already in power: Bitcoin Addresses like: 1BvayiASVCmGmg4WUJmyRHoNevWWo5snqC (without SegWit)
2. P2SH: Bitcoin Addresses like: 3P14159f73E4gFr7JterCCQh9QjiTjiZrG (SegWit)
3. bech32: Bitcoin Addresses like: bc1q76awjp3nmklgnf0yyu0qncsekktf4e3qj248t4 (Electrum only) (SegWit)
....
This explains the bitcoin addresses.
"1 or 3" is public address, note.
bech32 is a representation of address without upper and lower case, not a differing address.
https://en.bitcoin.it/wiki/List_of_address_prefixes