Linking Gmail accounts is a simple enough process. My recommendation is to create a primary public email address to link all other email addresses. Preferably an email that won’t diminish your reputation if you need to give out your contact details (example: firstname.lastname@example.org).
Getting on top of your email is simple enough until you run into small complications that become an annoyance to work around. If you find that you can’t link Gmail accounts through POP3 try these possible quick fixes:
If you run into further complications try searching for answers on google: Become a google ‘super user’.