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how do i port roms? (there are no good tuts)

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Hi there i would like to port roms. I have SM-t113 and everyone has just left this tab. No one develops for it anymore. I would like to get another custom rom then the already lineage os 14.1 ported from SM-G360H or whatever. Is there actually a good toturial which teaches me from the start to end with no points missing? All i find on yt is people who teach it a bit then there are cuts which leave us confused or the things they are doing i cannot find in my rom. I m new to this stuff. Can someone either guide me because ik this is the only way i could get android 7 or above with a better rom then Lineage os 14.1 (whuich is laggy).
if thats not possible any good tuts which tell me how to build aosp rom? I like stock pixel type android but i havent expirienced it. If i find one i would immidately flash it on this device. Well either of these two. please help me