1. Adobe Commerce Docs
Previously known as DevDocs, the Adobe Commerce Documentation database is one of the first places to start when troubleshooting a problem. You should make it a priority to become familiar with this (and extensively use their search feature).
An exciting benefit that comes from the documentation is seeing peripheral answers. As you read a section, you may find a related topic that holds just as much benefit.
For example, I was doing some research on after-plugins. I scrolled through other areas on the page and discovered the list of plugin limitations. I also remember finding the PatchRevertableInterface when reviewing patch documentation.
2. Adobe Experience League
You might ask, "what's the difference been Commerce Docs and Experience League"? The latter is the hub for best practices and tutorials.
You might like to know that SwiftOtter contributed an important segment related to GraphQL.
Important Experience League entry points:
- Commerce for Developers (getting started)
- Adobe Developer App Builder (overview)
- Commerce Upgrades
- Best Practices (valuable and should be required reading for every Magento 2 Developer)
3. The Magento 2 Source Code
Magento 2's source code is the rosetta stone to unlocking this behemoth. You, as a developer, are responsible for changing how this product functions. These workflows are built by source code—and this is easily accessible.
Take the same approach with the source code that I recommended for documentation. When you are viewing a class, glance at the other available methods. Review the constants. More importantly, see how this fits into the grand picture. You will be slowly assembling a mental diagram of the Magento application. Taking a little extra time every visit to a class will accelerate this process.
The other benefit of immersing yourself in the code is you will no longer see this "monstrosity" as scary. Instead, you will gain confidence. These hundreds of thousands of lines of code will begin to make sense as an incredibly complex application.
4. SwiftOtter
Used by almost ten-thousand people worldwide to grow and get certified.
Our focus on certifications started in 2018 when the Magento 2 certification program was "born". The first test was the Solution Specialist (now Business Practitioner). Joseph was one of many who saw the test as daunting, but he took his standard approach for preparation. He took the one-page public test syllabus and turned it into a hundred-page document. He shared that freely with the community. Of course, this was a big hit.
This continued through additional certifications, like the Adobe Commerce Professional and Expert developer exams. All the big players, Adobe, Rightpoint, Corra, DEG, and many others use these courses and prep guides.
The result is a well-oiled training program that works.
They run a yearly Certification Challenge designed to get as many people certified as possible collectively.
SwiftOtter still provides certification material, but they have branched into more general training, like the GraphQL course. They also run the second-biggest Magento-related community outside of Adobe.
5. m.academy
The brainchild of Mark Shust
Ohio, US, is home to much flat land—but still is easily more "hilly" than Kansas (where I live). Yet, Mark Shust's approach to training is not flat. He has been active in the community for the last few years. He is passionate about helping developers conquer the slopes of the learning curve. We have personally heard many positive things about his courses.
While his courses cover various Magento-related topics, he has focused most of his efforts on upskilling frontend developers.
6. Max Pronko / Mage Mastery
Payment Integration course and YouTube channel
What about all these "M"'s in the Magento community? Magento, Maxwell, Mark, Max. And, we have other "M"'s on our dev team.
Max is active on YouTube and has produced a course about customizing payment integration on Magento 2.