When you make a spell, you can have three different kinds of parts, which are often written as V S M. V stands for "Verbal," which means that you have to be able to talk in order to cast all or part of the spell. Somatic means that you have to move (whether it's just your hands or your whole body for a little flair, it's up to you) in order to cast all or part of the spell. Material means that the spell can only be cast if you have something that is made of matter. In general, you don't need to keep track of most solid components unless you have a spellcasting bag or component bag with you. You should start keeping track of them when they have a value, like 100 gold pieces. Most parts that don't have a gold value can be changed with a focus, but from what I've seen, most wizards and spellcasters don't use a focus. No matter what, it's your choice.