Aha... Forge modding is a bad place to cut your programming milk teeth. That and this forum assumes Java proficiency so it can focus on the idiosyncrasies of Forge and Minecraft (which is plenty).
Please take at least one formal programming class that teaches an object-oriented language, and then study Java (e.g. read a book). You can do both at once if you can find a Java class.
When you come back in a few months, keep an online Java reference bookmark handy, and consult it on every mystery error before posting here.