How can I learn gtk 4+ professionally?

how can i learn it ? im in iran so i can’t pay Because Iran is sanctioned‌!
can you help me to learn GTK4+

If you could not help GTK4+, please At least help me learn version 3
my English is not good!

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If you can help in Farsi language, even better
Otherwise, I have no problem with English

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You can start with official GTK documentation:

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Thanks

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