Additional Information
Jar
Clip top jars recommended as they can hold a lot of pressure, I heard Kilner(Trademark) are nice. Use clean ones. Before filling with content, I pour hot water into the jar and move it gently, to reduce to amount potentially unwanted bacteria. (And remove the water again)
Jam funnel
I don't mention it above, but I find a jam funnel really useful for filling jars with
jam kimchi. So when done often, my recommendation!
Salt
Type of salt: I use salt without any anti-caking agent or iodine, sea salt works well (some say salt additives can inhibit bacteria growth, I never wanted to risk it)
Gochugaru chili
Gochugaru chili apparently also called
Korean chili pepper, a mild chili with strong red color. That's the typical one for kimchi, if you use other types of chili adjust amount and generally adjust for taste.