It is safe to not connect to public WiFi if you are too concerned about your data. However, it is very important to access internet, it is recommended to have optimal level of security apps installed on your smartphone, PC or laptop before connecting to public WiFi.
WhatsApp launched the business version few months ago. Though it is still in beta stages, but has lot of to offer to its business users. With WhatsApp Bussiness, you can interact with your customers or potential customers more effectively by giving your landline number, address and other information.
No one wants to be tracked. This is same in internet. Users want to protect their privacy and do not want others to know what websites they were surfing. Some ISPs spy on you. VPNs are known as Virtual Private Network and it keeps your identity hidden. Moreover, users use VPNs in order to protect themselves from hacking attacks.