However, computing is a very wide area of technology and hence there is no one web site that is the answer to all your questions.
If you are familiar with the Google Search page or a similar search engine, use this to point you to a site to find out what you want to know. Just type in your question and see how many "hits" you get. A "hit" is a term for sites that match your query, to a greater or lesser degree.
Many sites offer tutorials for specific area's and you could click here for an insight into some of what's available.
There is no question in my mind; the more you read, the more you learn, and if you have any sense, you will learn throughout the whole of your life (no disrespect intended) :-)