While this isn't going to be an extensive and complete guide for this game, it will explain three important tips to always keep in mind, intended for new players who are confused on why their shots sometimes do not go as intended and planned.

The lie condition (Where your ball rests) isn't only about the grass or sand, but its incline and shape. You can press [Shift] to see the conditions of your lie.
-If your ball rests uphill, your ball will lose distance, go higher and be more sensitive to wind
-If your ball rests downhill, your ball will gain distance, go lower and be less sensitive to wind
-If your ball rests sideways, your ball will change direction to the corresponding incline
The more steep it is, the more severe the changes will become. Uphill/Downhill of course stack with sideway slopes.

A lot of people have a hard time with swing tempos being random and all over the place. The explanation for that is quite simple : Some shots require you to be slower with your swings compared to using a club for its maximum distance. This goes for chip, lob and pitch, and especially for the upswing. Experiment with swings on the chipping practice until you get the speed right. This also goes for partial swings for approaches : It also requires to be even slower

Putting in this game is not explained at all which is, a little dumb. After many tests of my own, I can conclude that your swings speed do not affect the power of your putt : Only the amount of time you take to hit the ball does - The time from when you start to pull your putter back to the start of the downswing motion. I also am sure that I saw a note on the putt marker helping you to stabilize the power of your putt (For instance if the marker is set at 75 feet away, the game will try to bring your putt power closer to how a 75 feet putt would be) but I cannot confirm this.
Here is a quick reference for putting distance depending on the amount of time you take before you downswing. These are rough estimations on a flat green with a speed of 144f. A green with less green feet speed than 144 means you will need more power, and more feet speed than 144 will need less power.
0.5 second : 10 feet
1.0 second : 25 feet
1.5 second : 60 feet
2.0 seconds : 100 feet

These three tips should be able to improve your game and make it more enjoyable to play. Keep in mind that the game aims to be like real golf. Getting birdies all the time isn't something that is supposed to be very easy to achieve. Making par is more realistic than aiming for birdie for every hole, and is a sign of being a good and consistent player.