the rotation layout is like so: X, Z, Y

the z axis rotation has to be looked on from a top down perspective, like on the nav map
0
/
-90 -----+----- 90
/
+- 180

thus a docking ring rotation at 0, 0, 0 would be pointing north, so u would want to put it on the north side of the planet (NOT the top of the planet, just pointing north according to th nav map)

the y axis rotation will take the left and right sides of an object and begin to rotate them in a circle, but still pointing in the same direction like so:
(btw, this is a FRONTAL view of an object, we will just make the object a line for now)

LEFT ------------------------- RIGHT
LEFT
/ +90 degree rotation
/
/
/
RIGHT

and 180 degrees would flip the object entirely, and you would be docking upside down

the x axis rotation will point the obect in a new direction by rotating it so it will point up (in the z axis direction) and down and also be able to flip it however you will be docking upside down like with the y axis
SIDE VIEW: (pretend its aligned corectly, im too lazy to use paint)

0 degree
__
< /
----

+90 degree

/^/
-----

and thats how you rotate stuff
however, i think i might be backwards with the y axis rotation, (+90 would make RIGHT be the top part instead if i am mistaken) but i think thats the way it is