>>2821109If they're like most animals even the fiercest predators won't directly attack unfamiliar animals. The ones to watch out for right away are the armored juggernauts like stegasaurs or ankylosaurs who don't fear predators at all, because we have no idea how aggressive they might be to some fool walking around in their territory.
After that, a simple weapon to fight off predators should be enough to teach them pretty quick not to mess with us, combined with the bright warning coloration that our clothes would make. Torches are good to carry day and night.
>>2821605Learn now how to make penicillin from scratch and various ways to extract sterilizing agents from the environment.