Well let's get a few things laid out straight so you know where you focus your attention..
HughesNet is your ISP, i.e., Internet Service Provider..they allow you to get onto the Internet. If they allowed an infiltrator to somehow get access to your computers in your home and harm them in some form, then they should be held liable for that lapse of security and made to fix it..
On the other hand, when you use their service to visit an e-mail service like Yahoo or GMail and have your account on their be compromised, it is usually not due to their doing but rather due to a phishing e-mail or weak password or the mail server being compromised by hackers..You cannot blame HughesNet for this..
Now when you visit website you traditionally prefix it with HTTP:// and if you don't specifically add that to the URL, it's being added for you. However, there is the HTTPS:// variant which adds a security layer on top of the standard HTTP access.
GMail allows you to visit and use the mail server with
HTTPS://, i.e., with security enabled all the time. Whenever you buy anything online and need to hand over your credit card, you'd want to make sure that HTTPS:// is set as well..
Now couple using GMail through HTTPS with a strong password and you should pretty safe from hackers. The next thing is that there is a TON of phishing (ask, if you don't know what this is) e-mail out there, so be VERY careful when and where you are entering password.
GMail just introduced a 2-step verification process that requires you to enter your password and couple that with a 6 digit number being generated on your smartphone..
Lastly, it's always the "dummies" with technology that get taken advantage of, either simply by having their accounts hacked or monetarily. So learn as much as you can about the technology you are using so that you don't get taken advantage of..