Well, the idea is most (decent) email services, banks, and online transaction sites, use SSL/HTTPS/TLS to encrypt the data between your browser and their servers, so as it traverses over the open (non-encrypted) wifi, and the 'cloud'/internet, snoopers only read gibberish. That doesn't make it perfect, as snoopers can still record the data stream and try to crack it on their own time... but in general, it's way better than sending info in regular text format. It's so popular, that even facebook has the option to encrypt entire sessions instead of just the login page/prompt. And then there was the heartbleed bug/hack that showed how even this process can be cracked wide open.
I am not planning to use public hotspots ,and laptop only for trading , for other stuff I use I pad air cellular
Iâm not even convinced that random wifi hotspots are that much of a security concern. Unless you happen to pick a really unlucky place with some dude with his laptop in listening mode just waiting for packets and youâre not using SSL, and/or youâre connecting to some totally unknown hotspot, etc. I think for the most part you will be ok. Iâm not saying itâs advisable, just that if you do use the odd hotspot, I donât think you should presume your information stolen.