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Are you meaning "make the colors color-fast?" I would hope that most modern crochet threads are boil-fast. I looked on the Red Heart site, and it looks like their "crochet cotton" threads don't run. If you had a question about a specific product, I'd contact the manufacturer for advice.
Most people start out with a pineapple doily if using thread. If using yarn most people start out making a ripple afghan. I get many questions from people having trouble with the ripple so I would not suggest it as a first yarn pattern to work. The simplest pattern would be working one stitch along your row until you are comfortable with it. For example, making a dishcloth or potholder in single crochet. Or a double crochet scarf. I have been crocheting for almost 30 years and one of my favorite projects is still a simple dc scarf. You can vary the work to make it more interesting by working in the back loop of the stitch which gives a pretty ridge. It's still simple to do, but looks a bit fancier. You can use a project like that to practice changing colors too. If you are already experienced with crochet, but just looking for an easy pattern to work, that depends on what type of pattern you are looking for. Afghan, scarf, hat, or whatever. Can you work in the round? Granny squares can be used in a variety of ways to make many different items.
doily you got it right
A cloth decoration (macrame or other) is a "doily or "doilie".
In a crossword puzzle the clue is "edges a doily". The answer is "tats"
She placed the delicate doily underneath the vase to protect the wooden table.
The cloth or doily on the headrest of a chair is called an antimacassar. It was originally placed there to protect the chair's upholstery from Macasser hair grooming oil (anti-macasser). It became a display place for fancy crochet work.
Doily - 2006 I was released on: USA: 27 December 2006 (Beverly Hills Hi-Def Film Fest)
They are named after the British draper who originated them.
A doily is a decorative mat usually made of lace or paper, placed under items such as vases or plates to protect furniture or add a decorative touch. They are often used in table settings to enhance the presentation of dishes.
If you are interested in purchasing a doily then you can find several websites available. Amazon, Ebay, Etsy, and PJP Marketplace are just a few of the online retailers that provide doilies.
This is commonly called a "doily."