HELP NEEDED Icon/Banner

I wanted to know how to get a User Icon and a banner

P.S I have heard it is limited in sive about what size will work also  any reccomendations I like Marvel,  Mario and Starwars thanks

you can get an icon by choosing one in your preferences BTW this belongs in welcome newbies

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thanks but what is BTW

thanks, but what is "BTW"?

 

Fighting_tiger