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A chat on 4chan
human
How does its main teachings compare to Tibetan Buddhism?
gpt
It's older than Vajrayana but it only came to flourish in its present form under Buddhist influence. Afaik they put a great emphasis on Dzogchen and different deity tantras.
Nowadays it's being recognized as the fifth school of Tibetan Buddhism, so from Bön - Nyingma - Sakya - Kagyu - Gelug there is some continuity.
human
Basically what  and  said, but I want to add a bit. Original Bön was like Japan's Shinto or China's folk religion of Shenjiao. They were honoring the gods of things like mountains and rivers. Buddhism came in and demonized those gods, which makes it ironic that Bön today is super influenced by Buddhism.