Download XCode (if it's not already on your computer) and find some Swift tutorials. Jump in here, too, and see where you end up going:
https://developer.apple.com/library...x.html#//apple_ref/doc/uid/TP40015214-CH2-SW1
Go to sites like codecademy.com, freecodecamp.org, or udemy.com and follow along with their tutorials, too.
Go take a class at a local school or community college, or attend a coding boot camp.
IMO, it's important to learn alongside other people in the same room at some point. You can glean a lot from online resources, but it's a lot of "monkey see, monkey do" -- you can make things happen, but you might not realize
why they happen. Being around other people can give you the chance to ask questions and get clarity much more quickly than usually happens in an online tutorial.