Only a lucky few can afford to learn new things for more than an hour per day. If this is the case with you, the problem of knowledge selection is yet more burning. Take a long-term perspective. To assume a responsible position in the society, you will need strong general knowledge on health, sociology, history, natural sciences, etc. Locate sources of information - unless you are in your student years, going through a collection of thick books may not be the best way to accomplish your goals.
Limited time gives preference to an incremental approach.
You can study lots of sources in parallel and pick only information of the highest priority. Obviously you should cast your net wide. TV, news magazines and the library are still irreplaceable in many areas. Effective learning must be based on repetition . Otherwise whatever you learn will sooner or later be forgotten.