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It has been said, “Not everything that is learned is contained in books”. In my opinion, this is true.

Firstly, books is contained a huge of knowledge and they are great source of information, too . A person in his lifetime could not has experience everything, but if he learns by reading a book on a particular subject he can gain knowledge over it in less time. However knowledge gained from books are just still theoretical . Sometimes, it could not apply in real life. Through experience all of knowledge is usefull and it is things we got from actual life.
Secondly, experience is things we have done and got from our tasks so all of them is meaning full .As a programmer, through books I got a lot of rules of code, syntax and examples so I have to remember too much but it is still not enough. I have to apply code in real project and this step is the most important. I have got many errors and problems that need to solve .Then, I could select the best choice for my coding. So if I just read book I don’t know what are the best choices for my coding and I have to remember a lot of things. The more I got experience, the more my tasks is easier. Moreover, many skills and knowledge can only be learned through practical experiences. You cannot learn swimming by just reading from books how to swim. You have to get to the pool and jump into it. Experience is the best way to develop your personal abilities.
Thirdly, knowledge learnt from experience will stay in our memory for a long period of time. There is a book that take a little time for reading but we need long time, maybe very long time to apply and get experience from it. The conclusion that we could draw things from practical experience instead of accepting the conclusion draw in the book by author.
So in my opinion knowledge can be gained both by reading books and by experience but the knowledge gained through experience is more important.