An example of how my digital footprint might effect my future opportunities is if I have posted something that is not appropriate it might effect myself to get a job. Another example is using email addresses when you were young for communication with college could be not wise, because none of the college admission counselor would accept childish email addresses.
You can keep your digital footprint appropriate and safe by using privacy settings. For example, Facebook you can look into Facebook proprietary privacy tips which will always manage your Facebook privacy. Another way to keep your digital footprint safe is use secondary email addresses to sign up for any site. The last way is not to overshare, you shouldn’t share to much of your private information.
It can be useful to have secondary email addresses, but your shouldn’t have 10 email addresses.