Today, I would like to point out one of the greatest source of information. Libraries.
In this digital age, the internet provides a vast array of information. However, libraries remain one of the key source of information and reading material for me. (Yes, I still prefer holding and reading physical books.)
Libraries provide me with great access to information, especially if you have access to libraries of education institutes. (another upside of formal education is its resources) These libraries tend to have a wide array of specific resources for various industries, and many a time the books are idling on the shelves waiting to be discovered.
Therefore, to all who have access to such libraries, I would urge you to make good use of it. There are knowledge in these books, some of which are not brought across in lectures. Lectures are great, but are too short to cover everything you will ever need to know.