In the program I made in PTC, I just made the game spawn 10'000 food bits, then whenever one was eaten, I would make another one spawn somewhere so there would always be 10'000 bits.
No idea, sorry. You should look at what the manual tells about it, that's what I usually do when I don't know how to use a command. (While your cursor's on the command, touch the "?" button in the up-right corner of the keyboard.)
I still don't understand how to perfectly use DISPLAY either. Apparently, you can only use one screen at a time... Unless you use XSCREEN 4?
Err, idk about INPUT, because I never use it. I usually GPUTCHR the question and make my own keyboard instead.
The only thing I still don't understand is, how do I make all the sprites (in this picture, the fruits) be the first one (in this picture, the strawberry)?
Like, in case you didn't understand a thing from the Web Tutorial?
Online forums and websites are the best way to get help. Of course, the manual is also a useful resource.
There's some neat things on Smileboom's website, too.