Re: How secure can my webpage be.
If your pi was connecting to the wifi network and you were using WPA2 with strong passwords then anyone "sniffing" would only see encrypted traffic between your device and the WAP. I'm trying to recall (it has been awhile) but I'm pretty sure that each connection to a WPA2 device has its own encryption certificate so even others connected to the WPA2 WAP with a valid log on password/key could not see another's traffic. If you planed to control the pi from within your own WIFI network then you'd not need https.
If you wanted your pi on the internet though using NAT/PAT so that you can access the pi from any internet connection in the world then you'd need to use https. You can use a self signed cert on the pi. Then just tell your laptop (other internet connected device) to import and keep that certificate. (You'd have to google up the steps) then that laptop would just trust that certificate. Or, the professional way (more expensive) would be to get a trusted 3rd party certificate like go daddy. There was theses guys (I cant recall the name.) that gives out free 3rd party certs for home users.
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