lol Voice-Over-Internet-Phone. It’s just a way to make phone calls that connect over the internet instead of phone lines.

Business aside just don’t give away your data (personal phone number, address, email, etc) to anyone except close friends and family.

The utility company, the online forum, the discount club at the grocery store. They are packaging up your data and selling it to advertisers, spammers, and scam artists (as well as being sources of data leaks) who use it to do anything from robo calling you all day about cruises and timeshares to stealing your identity.

Create throwaway email accounts that you can use for online shopping or app signups etc. Use a Google voice number if someone wants your number. Unless they actually need your home address because they are the water company or they are shipping you something, say no. If they insist, google an address of a hotel somewhere.

Your business will depend on your needs. At a minimum I would assume you need a separate email and phone number for it from your personal accounts.