Do you know what the most common tradition in Israel is? There are a couple of options, but it's probably "keeping Kosher." This simply means following Jewish dietary laws. Have you ever heard of keeping Kosher?
The tradition I learned about is Kashrut (cash - ruht), or the Jewish practice of keeping a Kosher diet. Kashrut has a lot of specific laws about what Jews like me can and cannot eat, but generally it means that Kosher people can't mix meat and milk (no cheeseburgers), can't eat shellfish (no shrimp or lobster) and can't eat pork (no bacon). Not everyone in Israel is Kosher -- not even all Jews in Israel are Kosher -- but most people are!
Kashrut comes from the Torah (Judaism's holy text), where all its laws are written out in a LOT of detail. Jews have followed those laws for close to 3000 years (sorta), but sometimes new issues pop up that different people have varying opinions on. For example, if your burger patty is made with fake meat (like an Impossible Burger), can you eat it with cheese? What's your opinion?