ASk HN: What do you know about day trading?

I have been swing trading for the past year and have made quite some money. I am thinking of going into day trading, with a lot of different views, some who tell me to go for it, others who tell me in the era of HFT, why would I want too.

Do you have any real-life stories, insights, money-making techniques, anecdotes or even articles on day-trading ? And what asset classes that are easy to make money with ?