I kinda don’t trust my home network because my brother is douche and I feel like he’s gonna do some weird things with the connection, so I prefer to juse use my phone’s data (unlimited data plan) to avoid any shenanigans. Hypothetically, how much harm can an evil wifi do?
Does using HTTPS avoid all risks? What about evey program on your computer or every app on your phone, do they also have HTTPS everywhere on? (I use Android btw)
How much could a VPN do better that HTTPS cant?
Kind of depends. The one thing that an untrusted network may be able to do is adjust routing tables. Some systems and some VPNs may be protected from this, some may not. At least the https connections should be secure but where you’re connecting can be trracked. DNS is vunerable too unless you set your browser system to use a secure connection to DNS server you trust.