Luckily for us, we are living in an era of global connectivity and access to lots of resources. Thanks to the Internet and people who likes to share, you might find almost all that you need to learn.
Free tutorials, books and courses are easily available without spending too much. So if you want to learn mobile development, databases, machine learning, cloud computing, or whatever computer languages you want, knowledge is just a couple of clicks away.
The thing is that out there you may find too much information about this programming language. Most of it will be extremely useful, some, just rubbish.
A great place to start if you are interested in coding. They have lots of free online courses and tutorials if you want to get the state-of-the-art in the latest technology and programming languages. You might find in @Udemy resources of Java, data structure and algorithms, Spring, REST, Selenium and more, both free and paid.
Even the paid resources are quite inexpensive. On promotion, you can get them for just $9.99: a small price to pay for quality knowledge. You will find excellent teachers there, like Jose Marcial Portilla, Colt_Steele, John Purcell, Rob Percival or Stephen Grider, among others.
Educative is an online learning platform that is attractive due to its text-based courses, since reading is generally faster than watching a video.
Some tutorials you must check:
30 Day Vanilla JS Coding Challenge
Build 30 things in 30 days with 30 tutorials
No Frameworks×No Compilers×No Libraries×No Boilerplate
You may also join to their Facebook group (freecodecampearth), ask questions and share experience. Or follow the community YouTube channel, with hundreds of free tutorials on Python, Git, GraphQL, SQL, database schema design, and so much more.
Katas @Code Combat
From here you might access to online courses from Stanford, University of Michigan, University of London, Imperial College of London, among others, both free and paid.
You can take the course for free, but if you want a Certificate to show you need to pay for it.