John2020:
- Is there any difference between MQL4 reference and MQL4 book?
- and if there is any, what should I study first?
+ thanks in advance.
If you are referring to "The Book" that was written pre 2014, then it is really outdated and you will be better using the reference.
Read old posts in the forum, you can really learn a lot.

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- Is there any difference between MQL4 reference and MQL4 book?
- and if there is any, what should I study first?
+ thanks in advance.