Is it advisable to write Kanji down while learning them?

I personally try to write Kanji, but not when I am on WK. When I am doing my separate Japanese study time, I use this Anki deck to learn to write them. It works well for me, I hope it works for you. Also, in regards to whether you should write or not, it’s really up to you and your personal goals. Like for me, I write because I don’t want to be behind when I take up Japanese at university.