I am currently a junior backend engineer and this is my first year working in the industry so I would appreciate any pointers/tips.
Conferences like PyCon, jsconf, Gophercon etc. can be a really great way to introduce yourself to the breadth of problems people are tackling, and can also be great opportunities to meet and network with other folks who can help you out on your journey.
Another good resource is safari books online, which has a subscription you can purchase to get access to a 'smorgasbord' of great books.
If you don't know what you want to learn, spend it on a coach or mentor.