One of the most useful tools I use as a freelance photographer is not a camera or a lens.
Rather, the most useful tool in my photography arsenal as of late has been a simple project tracker which I developed using Google Sheets. This tracker allows me to keep track of how much time I spend working on a project either in the field or in front of the computer.
Whether you are learning to budget your time or making sure to provide clients with accurate billing information a resource like this can prove especially helpful.