Hi
"Γίνομαι" means "become". Example:
Όταν κάνω χειμερινή κολύμβηση, γίνομαι πιο ανθεκτικός στο κρύο. - I become more resistant to the cold, when I swim in the winter.
In colloquial language it can also mean "be done":
Γίνεται η ομελέτα; - Is the omelete being done?
Έγινε η ομελέτα; - Is the omelete done?
"Κάνω" means I make or I do.
In the future tense, "τι θα κάνουμε;" means "what will we do?". "Τι θα γίνουμε;" means "what will we become?". It can also mean "what will happen to us?". There are situations where you can use the above interchangeably. Example:
Τώρα που έχασα τη δουλειά μου, τι θα γίνουμε; - I lost my job, what will happen to us now?
Τώρα που έχασα τη δουλειά μου, τι θα κάνουμε; - I lost my job, what will we do now?
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.