We all have yarn in our stash that we don’t know what the fiber content is. Here is a way to tell at least 4 different ones. Wool, cotton, bamboo, and acrylic.
Article: Russian down goats

All you ever wanted to know about acrylic yarn
This monthly newsletter tells what yarns are new and what yarns have been discontinued.
How Linen is commercially made
Does your yarn have a musty smell?
Try “Nature’s Air Sponge Oder Absorber”. Locally here in State College
you can get it at Walmart, Lowe’s, and Ace Harware.
How to knit with dog hair
Winding yarn
When you do not have a winder or a swifter here’s an alternative.
Knitting machine yarn explained
Weights of yarn explained
Working with linen yarn
I have never made anything with all linen yarn. Only have used a blend of linen.
Wool vs Merino Wool
How much yarn do you need?
This is a guide to give you the general idea of how much you need for several items.
How to protect yarn from moths
From the Yarn-School, over the rainbow helpful hints
This website has lots of useful information.
How to soften yarn
We are always looking for ways to soften yarn. Hope this article helps you with this problem.
How to care for knitted items

Lots of interesting information in this article. There is information on how to wash different yarn fibers, hand washing knitted garments, machine washing knitted garments, and blocking.
Yarn dying techniques you may want to try.
I’ve never dyed any yarn, but these look easy enough to do.
https://thewhoot.com/whoot-news/crafty-corner/yarn-dye-techniques?omhide=true
How to make bulky yarn out of fine yarn.
Bulky yarn seems to be in vogue now so if you have a lot of fine yarn that you would like to use up, this video will show you how to easily make fine yarn into bulky yarn.
Wool grades and sheep that grow wool
Lots of information that I did not know.
Click to access Wool_Grades_and_the_Sheep_that_Grow_the_Wool_Scan.pdf