So much of our lives - professional and personal - are dependent on data. Manage your finances. Maintain information about your customers. Keep track of project elements and timing. On and on. From simple to more complex data, understanding how to create, enter information and maintain databases in today's workplace is considered a basic necessity.
Companies often use one or more of these three popular spreadsheet applications to maintain data and information. If you are managing your own data, choose the one that has an interface that works best for you. You'll see that these tools here have a lot of overlap in function, but each has unique characteristics and capabilities. These tutorials provide a good starting place to learn how to use each of them - or get a refresh if you haven't used them in a while.