A nice list of websites I find useful when I get in a pickle or just need a reminder of how to do something. Let me know if you know of other helpful sites!
Lion Brand Yarn’s Learning Center: This was one of my first resources and I still like using them to refresh my memory on stuff. Videos and pictures to help you, in case word-only descriptions of techniques don’t work for you.
Knitty: I LOVE this site. Loads of great patterns and they also publish articles on various techniques (they taught me how to graft with a kitchener’s stitch!). Just open the site and use the search bar to see if they have anything on your problem.
Ravelry: Many of us already know of the joy of Ravelry, but I will preach it again for those who don’t know. Ravelry is an online community of knitters (and crocheters) where there are thousands and thousands of patterns ranging all levels of difficultly, using all types of yarn, and all sorts of techniques. There is something for everyone here and you will never run out of things. Most important to this page, though, is that Ravelry has wonderful forums where you can pose questions about knitting/crocheting problems and get feedback from other knitters. I have done this several times and I have been able to find a solution every time. People are super nice and polite and sometimes talking to a fellow human is better than reading an article or watching a dull video.
YouTube: There are TONS of videos on the internet about how to knit. If you’re trying to learn a new technique and just can’t figure it out, chances are someone has made a video. I find that sometimes just seeing someone else actually do it is enough to help me understand. Example: I didn’t know how to double-knit but I had a really cool pattern. So I went to YouTube and found this gem and I now double-knit like a pro. Just search around and see what you come up with.