What language should I learn

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http://ubuntuforums.org – I learned to program in the days of pascal, cobol and RPG and I'd like to learn something new. There seem to be so many. I am thinking HTML or python. The motivation is to do it as a hobby that may stave off brain atrophy but I'd like to work towards being able to write something useful. So what I'm asking is what are the good and bad points of different languages in terms of what I can use them for and how easy they are to learn and as a secondary point if I might want to earn some money somewhere down the line. Are there any good youtube tutorials? How difficult is it to 'learn Linux' - I'm (Hardware)