What's the purpose of A and B partition slots if both are flashed?

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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 Slot on Android via TWRP How To Port TWRP To AB Partitioned Devices Running

kokkedal slot spa Here's my build of LineageOS 20 Android TV for Raspberry Pi 4 Model B, Pi 400, and Compute Module 4 TWRP Alternative option is to use Hello, If you are sure only the slot b is modified, then flash on slot b This way, both will be stock afterward