You can improve your skills by making a few adjustments :-D :-D :-D :-D
1. When hoilding a ruler always have part of your hand on the mat
Not all on the ruler because it will cause slippage
2. Use a Spock hand position which is a wide spread between middle finger and ring finger and use the heel of your hand should be tighly placed on your ruler.
3. When using a 24 inch ruler place your hand on a spock position on the bottom half of the ruler. Cut 1/2 way and then move your hand upwards but the rotary cutter anchored where you left off . Use caution not to move fabric .
4. If you are using a 12 1/2 inch square up ruler. Put the heel of your hand and thumb resting on the bottom part of your ruler. Curt 1/2 way and repositon your hand and leave rotary cutter anchored. Move your hand up and position your #4 and #5 finger against the top of the ruler.
#####Always keep your hand flat on the ruler and cutting mat.
Okay now let's get better at cutting.
I went to a class and the instructor verbalized these tips and I jotted them down. Hope this helps some of you that have been commenting about inaccurate cutting.