I differentiate them like this:
Reincarnation -> MC starts from baby and remember their life in different timeline/universe; or MC remembers their past life without losing their present memory.
Rebirth -> MC start again from baby in the same timeline & universe. (I'm not really sure about this one)
Transmigration -> MC's soul enters an empty body in different universe without the memories of the body they took over.
Isekai -> MC enters different timeline or universe with their own body & soul, usually as a teenager or an adult.
Kinda make sense (⌒▽⌒) thanks
U sent me a treasure trove (≧∀≦) thanks
Happy to help! Hey don't forget as you're reading manhwas etc. If you scroll down to the bottom they recommend lists & tags of what you're looking for so that you don't have to wait for someone to give you an answer
I see i see
Reincarnation.... Transmigration..... Rebirth..... And what not so confusing (●￣(ｴ)￣●)