If you use a solid host like WPengine and a security app like wordfence.com it would be a very rare day indeed to get hacked. Source: about 1 year ago

If on wordpress, use the free version of wordfence.com to scan your site and identify possible viruses. Continue to use wordfence to protect the site, and if a successful business blossoms, consider the premium paid version. I'm not affiliated in any way, I've simply used the product with success for a number of years. Source: about 2 years ago

You can also read the documentation to learn about Wordfence's blocking tools, or visit wordfence.com to learn more about Wordfence. Source: over 2 years ago

I've used signup.com and signupgenius.com in the past and both worked well and have free options. But in looking around, volunteersignup.org would be my pick now and seems to be exactly what you're looking for. Source: almost 3 years ago

If COTA is too far, there's Family Medical Systems up north in cedar park, and they need volunteers too. They feed you and give you a shot at the end of your shift. https://signupgenius.com/#!/showSignUp/10c0f4fa5a723a0f49-volunteer. Source: about 3 years ago

I am on mobile and can only access the mobile site (even removing “m.” in the address bar redirects me straight back to it) so here’s the address with m. And without but no promise that either work from mobile/desktop - may be easier/more accurate to scan QR code or type in URL shortener by hand! Source: about 3 years ago