What is AB partition and How to flash roms in it

What is AB partition and How to flash roms in it twrp slot a slot b Dynamic Partition Super Partiton AB Slots TWRP 40 burning hot slot What's A B Partition Android System & Seamles System Updates, TWRP Slot A Slot B

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viy slot Install Twrp 3 Reboot Recovery slot No Internal 256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM From what I read, I should first boot into TWRP then flash it, else I will break things, correct? If I manage to basically dual boot my