I came across The Wizard of Shred recently, which despite the slightly cheesy name, turns out to be a site with really really good info.
The owner is Claus Levin, who has a popular YouTube channel and several paid and free guitar courses available. I really like his way of breaking down challenges into bite sized manageable chunks and providing detailed steps to conquer those challenges, whether it’s alternate picking, sweeping, legato or anything else you want to achieve on the instrument.
Unfortunately it appears that he stopped updating this site as of Nov 2013, probably to focus his efforts more on his YT channel and other sites he runs. Nonetheless there’s still quite the treasure trove of insights to be found on The Wizard of Shred. Do check it out!