It has some intro that really doesn't teach you much...or so I've heard. But on the official website, there's a section called "Instruction List" that shows you all the keywords and how to use them.
So I see you like Minecraft. Is that the reason why you asked SmileBASIC was similar to Java? If you want, I could, uh...
Teach you Java?
1そうだね 未プレイ