Help me plz :( wanna install a custom rom

Well i already tried once but i got a bootloop, i already fixed it.
I used twrp (i downloaded it from the play store) i had already downloaded the rom so i went to recovery mode and wipe everything except external sd card then installed but what i was always wondering was: what's bootloader do i have to unlock it before installing a rom? Or getting into recovery mode means that i have it already unlocked? Was that the why i couldn't install it correctly?

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