A couple of "mental side" of golf suggestions for ya, too, even though you didn't ask for them.
1) Golfers who start off playing well inevitably think to themselves and/or say aloud "This won't continue." On the other hand, if they start poorly, they are convinced that they will continue playing poorly throughout the whole round. You can't have it both ways, right? Either past performance influences future performance or it doesn't. Turns out that each shot is independent. Just because you just hit a bad shot doesn't mean the next shot will be terrible, too; it might well be an incredibly awesome shot. Most casual golfers shoot themselves in the foot because they don't understand this, and it becomes a self-fulfilling prophecy. So always remember that the next shot could always be good.
2) When the average duffer hits a really great shot, he/she thinks or says aloud, "I can't hit that shot. I don't have that shot in my arsenal. I don't play golf like that." But the truth is, you CAN hit that shot, you DO have that shot in your arsenal, and you CAN play like that. If you did it once, it means it can be done, and can be done again. Just as in point number 1, most golfers doom themselves because of negative thoughts. So, when you do hit a great shot, rather than deny it, accept it. "I hit a great shot. I am capable of great shots." These kinds of thoughts allow the great shots to become more frequent.
3) If you can train yourself to do this, try getting excited by great shots, but not too upset about bad ones. Look at the bad shots as an opportunity to try saving a score from a difficult situation, or as a way to learn how to play better. By the time you hit the next shot, all negativity about the bad shot needs to be gone. Look at the NEXT shot always, and not the LAST one, or the one two or three holes ago.
4) Greens in regulation are really important. Studies show that most golfers score better if there are no flagsticks. That should tell you something. Aim for the center of the green. Let's say the pin is tucked way onto the left side of the green. If you aim at the center of the green and pull it a little, you are close to the hole. If you hit it straight you are on the green putting for birdie and likely getting a par. If you push it some, you are a long ways from the hole but either on the green, of off the green but with a lot of green to work with. Duffers short-side themselves way too often. Aim right AT that left-hand flagstick and pull it a little and you are off the green with a very difficult up and down because there's no green to work with. So, again, on approach shots, be thinking "get on the green in regulation." This USUALLY means a) aiming at the center of the green and b) taking one more club than you at first think is correct (most duffers miss greens short way more often than they miss them long).
5) Think your way around the course, planning holes from the green backward. Example: a par 5 hole that is 500 yards long and you hit driver maybe 230 and 3-wood maybe 210. You're not going to get to the green in two no matter what. If you hit driver/3-wood and nut them both, you are now sitting in the fairway 50-60 yards away, which just happens to be one of the hardest distances for most non-professionals to hit, because it's not a full-swing distance for most people. So, plinth hole backwards, attempting to get to a comfortable, full-swing distance for your approach. Let's say you have a gap wedge you like and your full swing sends it 110 yards. 500-110=390. Now play your first two shots to get 390 yards. Maybe play 3-wood off the tee (210 in this example) and then play 4-iron or 5-iron or whatever your 180 club is. Now you have a full gap wedge to the green and you can just point and shoot without having to try to finesse a difficult shot. Makes life a lot easier. This tip alone could easily save 2 strokes a round or even more.
6) Likewise, if you are a short-knocker like me, occasionally it will pay to play long par 4s as if they were par 5s, especially if the hole is narrow or has punishing rough or a lot of trees just off the fairway. Hitting a 5-iron off the tee, while counterintuitive, may be productive. Another 5-iron after that, then a wedge, and then you are on the green putting for par, two-putting for bogey, thus avoiding the double, triple, or quadruple bogey from ruining an otherwise solid round.
I should stop before I bore everybody to tears ("too late for that," I hear you saying). I have more but I'll save them for another time.
"We are not provided with wisdom, we must discover it for ourselves, after a journey through the wilderness which no one else can take for us, an effort which no one can spare us, for our wisdom is the point of view from which we come at last to regard the world." --M. Proust