Never mind! I think there is no rule of timing for using kanji. Use kanji as much as you can. Because the best part and the biggest advantage of Japanese writing is a combination of three type of characters, hiragana, katakana, and kanji. hope your studying going great!

I agree with Masa-Aki san. There is only a guideline, preference, or common sense, but there is no "rule" for using Kanji. >I really cannot understand. In other words, you don't have to understand what nobody precisely understands or what you don't have to understand. I am a business person, and I make it a rule to use Kanji in appropriate amount. I would write "お元気ですか、よくなる、大丈夫ですか” but I don't mind a foreign (or even a Japanese) person write to me おげんきですか, よくなる,だいじょうぶですか, which does not make me think they are less intelligent. Personally, I don't like a writing full of Kanji, which makes me think "They are trying to make themselves look greater (than they actually are)" Good professional writers never use kanji so much. e.g. *** Original one 権力が不安定な中米の小国がこうした苦境に陥っていることはずいぶん前から知られていましたが、アメリカはずっとそれを放置してきました。こうして、ひとびとは自分や子どもたちの生命を守るために移民キャラバンに参加するほかなくなったのです。 だったらどうすればいいのでしょうか？　これは、理論的にはすでにこたえが出ています。アメリカがいますぐ「麻薬戦争」を止めて、すべてのドラッグを合法化するのです。 *** Full Kanji one (I edited　””) 権力が不安定な中米の小国がこうした苦境に陥っている”事は随分”前から知られて"居"ましたが、アメリカはずっとそれを放置して”来”ました。こうして、”人々”は自分や”子供達”の生命を守る”為”に移民キャラバンに参加する“他無くなった”のです。 だったらどう”為れば良い”のでしょうか？　これは、理論的には”既”に”答”が出ています。アメリカが”今”すぐ「麻薬戦争」を止めて、”全て”のドラッグを合法化するのです。 https://www.tachibana-akira.com/ **** By the way, if you take the rule of "always use Kanji if there are kanji" technically, then " 良くなる" is not sufficient for "よくなる". It should be written "良く成る“ And "お元気ですか” should be ”御元気ですか”

Use Kanji if there are kanji for whatever you are writing. Especially, if you are in Business, wiring with no kanji or less will people to think you are not so intelligent (also, kanji shorten some words by using them ). if you are just practicing, learn grammars and sentence structure perfectly and then, start studying kanji. That's my recommendation....