• Recognize gaps in knowledge of Frontend programming
• Find resources for next learning steps

You are on your journey towards mastery of software development. Ownership of your journey includes knowing what you know and what you don't know.

Frontend Masters' Frontend Handbook is a compendium of overviews and resources for mastering frontend development. It doesn't make a great end-to-end read, because it's mostly made of links to other resources. Instead, as you page through the readings and resources, you should maintain lists: "Things I know" and "Things I don't know". From the list of things you don't know, you can bucket things into "Things I want to learn" and "Things I'm fine not learning". Next, prioritize the areas of your learning, and use the handbook as a reference for learning in those areas according to your priorities.

Reading (scanning) this book and compiling your lists should take about 2 hours. Mastering frontend development will take a few years.