I personally like this forum because i get all types of knowledge here. Different different sec section have different information.
You overvalue the forum and I believe we can not get all knowledge here. We can learn a lot in this forum but not all knowledge on Earth is available here.
Additionally, spend time and learn something from your time depends on how you spend your time, what you learn, what is your learning method and so on. Most important, if you have good attitude, you can learn and have good practice. So attitude, intention are keys to start your journey.
With time, you can adjust your learning method as well as increase your knowledge and skills. You will figure out better ways to learn more effectively and work more productively with a same time budget.