Choose a standard width for your shelves and use painter's tape to mark the exact width you want
Use a level to ensure that the painter's tape is perfectly straightUse the painter's tape to create a guide for where to place your shelf brackets or hardware. This will help ensure that your shelves are level and in the correct position.
Use a pencil to mark the exact location where you want to place your shelf brackets or hardware, using the painter's tape as a guide.
Next place the shelf brackets or hardware directly over the pencil marks you made on the painter's tape and install hardware. This will ensure that your shelves are level and in the correct position, without the need for a measuring tape.
Tips
Floating shelves with brackets are a popular type of shelving that are used to create a clean and modern look in homes. These shelves are called "floating" because they appear to be suspended in mid-air, without any visible means of support.