I've played chess casually for years, and my main observation is that no one actually wins if both players are reasonably well matched. The balance tips when a player makes a mistake that leads to them losing. Consequently, the only thing you really need to do to not lose is to make sure you don't make daft blunders, and to recognise when your opponent has. I'm pretty sure it's different at higher levels where people don't make those errors nearly so much, but if you're just starting out, rather than trying to win just remember to not screw up.