1) Look for verticals/lists of resources. These exist in all fields, awesome-lists are just an engineering example, universities keep lists of open courses, list of book recommendations or lists of open-sourced books.
2) Look for key figures in that field. PhD Researchers, Conference Presenters, TEDx Talkers, Professors, Founders of Companies in that field. Follow their pages/blogs/twitter accounts and ask them what resources do they recommend for beginners. Compile your own vertical of resources based on cross matching the resources here with the ones you found in other verticals.
3) Look for courses, new ones are usually offered on MOOC Platforms, archived ones can be found on university websites. Check the reviews of such courses and pick the most beginner friendly one. Depending on the field, if it's not technical then you will have to look for courses elsewhere, for example: The Great Courses.
By now you should know, roughly, the best resources (Books, Articles and Courses) and how to find more (verticals and people in that field).
4) Learn the terminology. One way to learn the terminology of a field is to pick the book you decided is best to start with using the previous 3 steps, open it and go to the index section, read the index and start googling terms as you come across them, for example: If I am exploring Data Engineering and I come across the word or term "stream processing" then I will start googling that term. Familiarise yourself with as much terms as possible.
5) Commit to reading at least 1 book, going through 1 course and trying to apply as much of what you learned as possible. Technical subjects are the easiest to apply this step to, since you can start a side-project at anytime.
P.S. you can always ask for guidance in this, you don't have to repeat all the steps for all fields, for example, you can submit an "Ask HN" post asking for resources about X topic or a question on a related Subreddit such as: /r/PostgreSQL.
Best of luck!
EDIT: typo