Stashed means it’s yarn that is part of someone’s personal “stash” of yarn. A few people may not, but most of us have a bunch of stash yarn we bought for a project or because it’s pretty or a multitude of other reasons. :teehee:
What you want to look for when subbing yarn is gauge first of all. Fiber can be somewhat important as well. For instance if the pattern uses acrylic and you’d like to use silk you need to keep in mind that the two yarns can behave differently when knit even if they are the same gauge. Silk is very soft with little body which makes it great for some scarves and shawls, but maybe not a boxy, tailored jacket.
There are a couple ways to search sub yarn. You can go to the project you want to do and look at yarns used for that project by other people. There’s a tab for that within the pattern or project pages. You can click the project that used it and see what the person said about it, go to that yarns page and read the comments… Always check the gauge because done people go off gauge intentionally.
You can also use the filters in RAV to search for yarns within certain parameters. I generally use the first method of seeing what others have used.