Welcome!
Different fragrances have different safe usage because of the ingredients used. Some spices, for example, can only be used at a small amount because they can be irritating to the skin.
I prefer to go by weight instead of teaspoons as I find the teaspoons inaccurate.
BrambleBerry has some soapmaking books that you might find helpful. Alicia Grosso has an excellent soapmaking book. It's available on amazon.
Take your time and do your research. Each oil or butter adds a different component to your soap recipe.
You might find this sticky that I posted helpful.
viewtopic.php?f=2&t=3800