I posted another reply to your question but it has been removed / hidden, so until it appears I'll just mention Duolingo isn't the greatest for Japanese (and is awful for Korean, for that matter). It's okay for improving memorization of hiragana and katakana, but you don't learn how to write them, which is half the point. It also introduces kanji without explanation, and, again, if you're not learning how to write characters you're not learning too much. The vocabulary it brings up is introduced kind of hap-hazardly. If you are just learning for some quick lessons on spoken Japanese, go through the NHK World lessons for free: https://www3.nhk.or.jp/nhkworld/en/learnjapanese/

Whatever you choose, just try to stick with it and find ways to introduce it into your life to build meaningful context. You're not going to be fluent after four weeks of free lessons, but you can find things to read, things to listen to, etc. Too many weeby websites promise too much, and focus on too narrow stuff.

I messaged the mods about my other post about finding teachers / tutors, so if that gets approved there will be some other suggestions.