One of the oldest balloon websites on the internet, Balloon HQ has a wealth of information for new twisters, as well as a huge library of balloon photos. Part of the site is behind a paywall, so you will have to sign up for membership, although the bulk of the content is freely available. As of this writing, the site is also hopelessly outdated, though I've heard from folks with good authority that they are actively working on a full redesign which should be up soon.
BiBaBalloons is a cool, newer blog with a really fun, slick website. What's really cool, though, is that (like Mr. Boma on YouTube) she's catalogued her favorite tutorials in to curated lists! This is well worth checking out.
I really like Patricia Balloona's blog. It's a fairly young blog, and it follows Patricia's growth as a beginner, all the way up to doing advanced sculptures. If you're just starting out, it can be encouraging to watch another newbie twister's journey!