: Leave room for the design to "breathe"; don't feel the need to fill every inch.
: Draw any vector shape (like a circle or diagonal line), select it, and go to View > Guides > Make Guides ( Ctrl/Cmd + 5 ).
: Draw a rectangle, then go to Object > Path > Split into Grid . Enter your desired rows and columns, then convert them to guides.
: Go to View > Guides > New Guide Layout to instantly create a multi-column grid with gutters and margins. 2. Creating a Brand Style Guide