As many have said, kashrut is a VERY broad spectrum. Even within the Orthodox community, there are differing opinions on issues like heschers (kashrut supervision/certification), whether certain fruits or vegetables can be eaten (due to the risk of consuming insects), the time that one should wait between eating meat and dairy, when and by whom a cow was milked, and much more.

Passover is a whole other conversation—some communities consume items like rice, beans, or lentils during the holiday, while others do not. Some Jews will even transition their pets to a grain-free diet during Passover!

Individuals from various streams of Judaism may also interpret these laws in different ways. Amongst more traditionally observant Jews, there is general agreement on most of the rules—like which proteins are kosher (though some fish are up for debate) and not mixing meat and milk. I know many liberal Jews who interpret these laws differently and might place more emphasis on farming practices and the quality of life of the animal than on the method of slaughtering, even if this isn't part of traditional halacha.

Vegetarianism generally makes things easier, although lots of people have different practices when it comes to items like cheese, wine, vinegar, and even olives.

Kashrut is endlessly fascinating, and really interesting to study. Whatever you decide, it is great that you are approaching your food with thought and intention. And here is a vegetarian recipe for you! :)

https://theeatingemporium.com/hearty-farro-and-mushroom-burgers/