Practice...
If you read and read and read, not too much will stick. If you apply what you learn in practice then you will get it much quicker! Try it. Read about a concept and then test it out with your own camera. Then build upon it. Read about something else, and then figure it out on your own camera. Repeat... you will remember the functions and features and tips much more quickly with that hands on experience.
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Don't take life too seriously, you aren't going to get out alive anyway.
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