This is a relatively short section and rather simple, only the last puzzle might frustrate you.
The monastery is found next to the town towards the sea. As you enter you will notice a square table with a tree that controls the light shades.
Given the negative votes, if you prefer a video guide here is one:
Face the right side of the room and complete the puzzle by making a U shape. The shades will open and you can now solve the puzzles outside in the garden through the blinders.
Once all three are solved, you can move back inside to solve the four pillars puzzle which requires you to take clues from the branches of the tree in the middle by standing in the right position to gain perspective.
The first two are rather simple, follow the pattern set by the branches.
The last two are a bit trickier.
3 - Follow the path that is set by the branches but you must memorize it and move away to enter this pattern:
4 - This one is similar but is frustrating. If you look on the floor you will find a broken piece twig that was attached to the tree. This can only be placed in one way -
Go outside and flip the switch to activate the laser.