The bad thing about being in a dinner situation where you have 4-6 different kinds of forks is that the people there will definitely judge you for not knowing them. You'd think that people would be understanding with that many forks, but no. You're in the last place to confuse your salad fork with your crab fork. Even if you're not dealing with more than two forks, it's important to know which is which.
Just don't be the guy who uses that knowledge as an excuse to go, "um, actually, you're eating your salad with a cake fork." It's a quick road to mansplaining. It's better just to confidently use your different forks and wait for someone to ask you. You might end up marrying the person who asks you. It's a total meet cute.