[DrSavage]

1. While you shouldn't be playing with money you can't afford to lose, there is nothing wrong with investing money you can afford to lose when conditions are right.
8. Preflop mistakes are usually the most expensive ones because people constantly repeat them over and over again (I'm talking about limit here). Postflop on later streets most mistakes are usually not as terrible as they tend to be neutralised by constantly growing pot odds.
9. Recent hands should most definitely affect your play. Stealing the blinds will be more successful if you've been folding for 2 orbits than if you've been raising every second hand. Hands you've taken to showdown recently and the image you think you are projecting on your opponents make a very strong impact on how you should be playing your cards.