Redirect the standard output for a command that is being run in the background to a file. This prevents the output from the command appearing on your screen and interrupting your current work.
If the command is likely to produce error messages you will need to redirect standard error. Otherwise all error messages are sent to your screen.
Do not run an interactive command that requires you to type something at the terminal as a background job. If you do the job will stop and wait for user input. You will then have to kill its process.