Guidelines capture all the visual rules for clients´ specific style therefore they must be followed. You have to be familiar with guidelines of the task you work on and be able to apply them correctly in all slides.

Guideline file usually contains these rules you must follow:
usage of correct template and layouts
slide frame
font type and minimum font size rules
correct color usage
bullet points style and indentation settings
textbox margins
heading and textbox style
icon style
table format
graph format
any other guidelines defined in the guideline file

What does it mean if you got this tag as feedback from an admin?

Some guidelines were not followed
You haven´t informed your admin about making exception to the guidelines due to some specific reasons

What can you do to become better?

Study the guidelines carefully before starting on the task
If you are already familiar with the guidelines make sure to recheck if you didn´t forget about any rule
Keep refreshing your memory even with guidelines you remember because they might have been updated with new rules
Use the help of checklist that you can see for some clients at the side panel of your task
Read all available clients notes that might contain additional information to the guidelines
If you have to disobey some guideline rule due to some reason (fx. heavy content) inform your admin
Remember that all guideline rules are equally important therefore do not underestimate less visible rules such as textbox margins or correct bullet points indentation

If you would like to learn more about how to understand guidelines watch this video:
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