But don't just do courses. Have a project that you've aligned with the outline of the course you're currently on. Small at the start, then getting bigger, over several years, integrating a new skill but still applying older skills, so they don't get rusty.
And as well as the front- and back-end site, get dirty with the OS level too. The ins and outs of configuration files. Perhaps contribute to mailing lists, or have a StackOverflow profile where you start by lurking, then getting interactive. Expect to get criticized, sometimes rightfully, sometimes from armchair engineers, and learn from both - the knowledge and the tact.
As novicei stated, don't wait. Get started now! :)
You'll get out of it how much you put into it. If you spend countless hours learning and then building projects you will learn new things very quickly. Don't get caught watching tons of videos & screencasts while not building anything.
You can read 1,000 books about surfing but when you go to surf you'll fail repeatedly. The same goes with building software. Read code and then write code 5x as much.
The courses are good for beginners, but to take it to the next level you need to build a sizable app and get it to production. There are things you'll learn from putting a project to production that you wouldn't learn otherwise. Remember: software is built for users & actual people, not just machines.
Looking to do big 4 consulting? A degree will go a long way.
Looking to dive in at a start-up? A portfolio probably carries more weight - regardless of a degree.
There are always exceptions, but that's on par with what I've seen.
!mobile_disclaimer
You can't reliably learn all of this from an online course, although it might be a good starting point, you become a good full stack developer after years of experience.
If you want to learn Python I recommend https://pythonspot.com/introduction/
"Learn by doing."
can you become a developer with no CS degree? sure as hell you can! my formal education lies in philosophy, economics, education, fine arts and spanish language and literature. i never took a single computer science university class. at least, not formally and on campus. yet, i have a decent career as a developer, serial tech entrepreneur and i was even teaching programming and CS. but, i was reading a lot, had my share of tutors, worked a lot, worked a lot with some of the world's best developers, took some online courses, tried many things, failed many times, some other times even succeeded
before becoming a developer, i had a successful career as a graphic designer and a photographer. luckily i was always a geek and loved technology. i've literally faked my way into my first developer (front-end) job at one silicon valley startup more than ten years ago. i was doing plenty of web design work and even more corporate identity work back in the day. my coding was rusty and definitely non-web given i previously fiddled with programing in the 80's and early 90's. the above mentioned startup's cofounder liked my visuals. he asked me can i do their UI, coding included. i said ''yes''. while making sure he liked what it looked like, i was studying CSS and HTML pretty hard. front-end back then was a pain in the ass to deal with. but, boy, did i get it wrong. so i literally had to rewrite all front-end code two days prior to deadline. well, somehow i've made it. was offered a job. accepted it. then i was hanging out with some of the brightest programmers, learned from them and on my own. as business grew up and they were onboarding designers (very few designers could code back in the day and transition from print to web was painful, while majority of developers had no clue about design. there were no tools/frameworks/libraries/templates/themes available either), i helped designers understand tech concepts, while i was helping both developers and designers communicate with each other
except for some hardcore computing stuff, you really don't need a CS degree. for stuff more advanced than developing database-driven websites and apps, having domain expertize is way way more useful than holding a CS degree