Global Vars

[ingsan]

Please excuse me with this silly question I've always worked with Global integer variables and never felt the Need to ask myself about Local Vars, real vars and String ... I never attended any C training and learned the few things I know by myself So I know I'm missing a lot.
If someone ... anyone could spend some time explaining to me the difference among all these. I really want to structure my codes and go right to the point instead of doing some approximate things. Please help

[jazz_e_bob]

Local Vars are good for things like "mass" or "health" or "playerNickName".

Once you declare "health" as a local var every actor will have its own "health" property.

Global Vars are good for things like "gravity" or "gameIsOver" or "highestScore".

DATA TYPES
Integers (non-decimal numbers)
Real (decimal numbers)
String (word(s))

[ingsan]

You'r ethe MAN !
Thank you so much for your precious help. Now I can see the light