You ll need a drill with a no.
Large gap between cabinet and wall.
Clean dust and dirt from the wall and the cabinet.
Below i ll share photo examples and the why behind how i filled the space above cabinets in my own home.
How to fill space between cabinets and ceiling here are several options you can build the cabinets to the ceiling most expensive option keep the area open no cost build a soffit to match the cabinets or add a drywall soffit.
For gaps between the wall and the built in cabinet use a pin nailer with 1 inch pin nails to attach 90 degree quarter round molding.
Close the gap between counter and wall if the gap between the countertop and backsplash is more than 3 8 inch it s generally too wide to fill and is best handled with trim but you can try to close the gap to give yourself the caulk option.
2 phillips bit a flat pry bar wood shims and a hammer.
Also one set of open shelves by the kitchen window sits flush to the wall but the opposite set of shelves leaves a gap between the edge and wall.