Learning Swift - Best suggestions

Hey everyone,
I’ve been messing with complex nested if/then statements in Excel for many, many years, and recently dabbled in VBA. I’ve decided it’s time to learn Swift for Apple. Mainly for kicks, but also the fun of creating an app if I find a need.

For those of you that know these things, what’s your biggest suggestion for learning? Most useful tips? Things to watch out for? Etc.

Thanks!