What are some ways to learn Japanese quickly? Any tips or rules?

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These are links I used before to answer questions of the other people.

※[Not about Japanese]
(There are some words and expressions I don't understand, but I think it's interesting)
･https://youtu.be/5MgBikgcWnY
･https://youtu.be/YLwFbwPbqyY

〇[To study Japanese from zero]
●[fundamental information about Japanese language for learners]
･http://a1.marugotoweb.jp/intro_to_jp.php?p=p
･http://www.youtube.com/playlist?list=PLPSfPyOOc... (Introduction to Japanese)
●[To learn hiragana]
･https://youtu.be/6p9Il_j0zjc
･http://benri.cyberlab.info/hiragana/ (table)
●[To learn katakana]
･https://youtu.be/s6DKRgtVLGA
●[To learn grammar]
･http://www.guidetojapanese.org/learn/grammar/basic
●[FAQ]
･http://www.youtube.com/playlist?list=PLPSfPyOOc... (Ask a Japanese Teacher)
･http://www.sljfaq.org/afaq/afaq.html

〇[About grammar]
●[Japanese particles]
･https://8020japanese.com/japanese-sentence-stru...
(↑Sentence structure)
･http://kwhazit.ucoz.net/ranma/g_part.html (Explanation and some examples)
･https://en.m.wikipedia.org/wiki/Japanese_particles (List)
●[Japanese sentence (three types of scripts, hiragana, katakana and kanji)]
･http://www.iwillteachyoualanguage.com/how-to-wr...
･https://youtu.be/O27TgLW6pCU
(↑He is talking about readability)
･https://youtu.be/CFq2Y43DY0U
･https://youtu.be/x9-e_3GHrzw
(↑It includes language history. Note that [今日先生が起こった(Wrong)➡怒った(Correct)])
●[Verbs]
･http://www.guidetojapanese.org/learn/grammar/verbs (Some verbs)
･http://www.japaneseverbconjugator.com/JVerbList... (The list of lots of verbs)
●[Verb imperative forms]
http://www.fluentu.com/blog/japanese/japanese-c...
●[Adjectives]
･http://www.guidetojapanese.org/learn/grammar/ad... (Explanation)
･https://quizlet.com/16296976/japanese-adjective... (flash cards)
･http://www.learn-japanese-adventure.com/japanes... (List)
●[difference between "desu" and "da"]
･http://www.guidetojapanese.org/learn/grammar/po...
･http://www.guidetojapanese.org/learn/grammar/fo...
･http://kwhazit.ucoz.net/ranma/g_verb.html#copula (copula)

〇[Honorifics, pronouns, phases, some tools]
●[Honorifics(-san, -kun, -sama, etc.)]
･https://manga.tokyo/columns/lost-in-honyaku/jap...
･http://www.sljfaq.org/afaq/titles.html
●[1st-person pronouns]
･https://youtu.be/Q2Y7ET-TyCs
･https://youtu.be/UTDna6oWA3g
･https://youtu.be/dFcyaWgGpJM
･https://manga.tokyo/columns/lost-in-honyaku/wat...
●[2nd-person pronouns]
･https://youtu.be/hpqqk5exUno
･https://manga.tokyo/columns/lost-in-honyaku/fro...
●[Basic phrases]
･https://youtu.be/n6ciMT6KhVo (25)
･https://youtu.be/HVFk4CSjYHc (8 for travelers)
●[bad words]
･https://youtu.be/jlGoZ1HpyNE
●[Internet slang words]
･https://youtu.be/4UVEtlUxfVs
･https://youtu.be/777dowGCMp8
･https://youtu.be/Bi_sFSFCv3k
･https://youtu.be/ScQbogJ0W0s
●[Verb conjugation practice]
･http://steven-kraft.com/projects/japanese/
●[Reading out books for children]
･https://youtu.be/cRB8oBYv9Qg
●[Tips to study]
･https://youtu.be/bX8zfeI7Vg4
･https://youtu.be/wk5l1UCCXKk
●[vocabulary]
https://iknow.jp/content?utf8=✓&language=en
●[web dictionary]
･http://ejje.weblio.jp/ (for Japanese people)
･http://tangorin.com/
●[other apps]
"Duolingo", "Memrise", "Obenkyo" (To learn)
"italki", "HelloTalk" (Looking for talking partners)