I would change this to:
Invest what you can afford to.
I gamble with what I can afford to lose, but I expect a return on an investment or, at the vey least, to retain most of my capital, so a different mindset is required.
I agree also
3) Invest what you can afford to lose, majority of people will lose the majority of their money initially.
I know this happens a fair bit of the time but you can increase your chances of this not happening by being as best educated as you can and having the correct mindset for investing/trading. There are some great books mentioned all over the ASF website that can help you out.
Just cause most lose there money in the first year doesnt mean you have to take that path too. Happy reading to you