mql4/mql5 functions question

Hi all
I have decided to re-embark on teaching myself coding that I started a few years ago. I have been studying old EA code, learning the basics again but I am getting a bit confused.
I thought I would be starting to write mql4 code when i open the MetaEditor but the template looks applicable to mql5. I have attached jpeg to show more clearer my query.
The MQL4 book mentions "In MQL4, there are three special functions in total. They have predefined names: init(), start(), and deinit()" but the template in the MetaEditor produces int OnInit() & OnDeinit and no no start() so is this mql5 programming?? its a bit confusing.

Hope someone can clear this up for me..
Cheers
Downunder

These are the new functions since MQL4 programming language has changed ... around build 600 ...

Thanks FerruFx
Found info on these changes in the MQL4 book "init(), deinit() and start() predefined functions have remained for compatibility, however, OnInit(), OnDeinit(), OnStart(), OnCalculate() and OnTick() ones can now be used instead"

Cheers

That's it!