Is it a good idea to learn Swift ?

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Hey, I'm clearly not a pro dev, I've just finished learning HTML and CSS. Last day I've find a new language the "Swift", apparently it's about IOS apps. It sounds quite interesting, but I need a few minds on the subject :  Is it a good idea to learn Swift or should I focus on other classic languages like C, Python, Java, ... or do you have any other language to propose ?

Hope you're having a good time, see you soon guys,
Elohim9