Grammar Guide to Japanese - By Tae Kim (there also exists the "Complete Guide to Japanese" by Tae Kim, this is a work in progress/not yet complete).
A summary of the guides is basically this: first, learn hiragana and katakana using the links in Hiragana/Katkana section further down this page. The Tofugu links is a good starting place.
Next is grammar/vocabulary. You can either use a structured textbook or a more free-form online grammar guide like Tae Kim. Either one works, try one or both and stick with the one you like the best.
For vocabulary, three nice options are Wanikani, Memrise, and Anki. If you go with the Anki route, consider using this deck, which is the same as the deck in the above link, but with the front and back flipped around to display sentences on the front rather than single words, as this will force you to learn words in context.
For translation, try to avoid Google Translate. Instead pick another one from the Dictionary list.
That's it. There are many, many paths to learning Japanese. The most important thing is to choose the one you enjoy. If you don't enjoy your study, you won't succeed, so keep searching until you find the resource or study method that you enjoy. Look through all the resources below, ask someone if you need help, and good luck.
Textbook
Textbooks provide you with structured learning material.
Genki👶
Everyone's favorite Japanese textbook. Recommended for beginners.
Description: The second edition of the most highly regarded teaching textbook on the Japanese language, covering speaking, listening, reading, and writing to cultivate overall language ability. Each lesson in the revised edition features a new section dubbed "Culture Notes", and now includes the audio CD companion which is in mp3 format ready to install on any music player. In Japanese/English.
The "Tobira" textbook combines the practice of all four language skills (reading, listening, writing, speaking) and is designed for use by students who have completed a beginner level Japanese textbook, or in terms of classroom time, have taken somewhere between 250 to 300 hours of Japanese study.
The primary goals of this textbook are to solidify the grammar, vocabulary and kanji foundation studied during the beginner level and to develop all 4 language skills. What makes this book unique is that you can learn Japanese using multimedia besides the textbook.
Official - Unlock multimedia content and Anki deck with special code in the textbook.
Tobira: Power Up Your Kanji - With it, students can study a total of 800 kanji-the 297 kanji generally introduced in beginning-level textbooks and an additional 503 kanji introduced in Tobira.
Google Drive A | B - contains links to many textbooks such as Japanese for Busy People, Japanese - The Manga Way, and An Integrated Approach to Intermediate Japanese. Additionally, there's some reading resources such as Yotsubato, and some listening material.
Hukumusume Fairy Tale Collection - A website where you can read and hear traditional folk tales, legends and fairy tales - from Japan and all around the world - read aloud for you in Japanese.:jp:
Kyoko Shinbun - Fake Japanese News(similar to The Onion), podcast available.:iphone::jp::older_man:
用例.jp - Search engine for Japanese sample sentences.:jp:
Satori Reader - Japanese reading and listening practice, first two chapters of each article is free.💰
Keio University Reading Materials Bank - The site is mostly in Japanese, but follow the 1-stars for the easiest reading materials. It's great because there is an English glossary integrated into the articles.
Japanese IO - Learn Japanese through fun and easy reading practice. 👴
PressReader - This website/app offers 毎日新聞 Mainichi Shinbun digital daily newspaper and other Japanese language publications for free with many American libraries, please check local library to see whether it is available. See detail. Otherwise paid plan available. 👴 💰
ImaWakatta - You can start reading real Japanese today, regardless of your level. ImaWakatta has stories with audio that include native speakers and professional voice overs. Every story has dynamic highlighting so you can follow the audio line by line. Includes 4 free stories. 👶💰
Listening
SuperNative - Trains you to hear, read, and speak Japanese using over 10,000 bite-sized clips from TV and movies. ⚠️ Only Chrome browser supports voice recognition practice.
Delvin - Practice Japanese listening and reading with authentic Japanese video.
mykikitori - Practice your Japanese learning skill.
Podcast
Podcast Ranking - Japanese Podcast ranking website, discover Japanese language podcasts.
NHK News Podcast - Three podcasts available: Japanese news:older_man:, English news, and Easy Japanese.
Bilingual News - Bilingual English and Japanese news podcast. Casual and unedited colloquial language learning experience through a weekly review of relevant news topics.:older_man:
Speaking
Online Japanese Accent Dictionary - Learn the correct accent to properly pronounce Japanese words. Lists of words are categorized by textbook.
DaiWEEB - Japanese anime with both Japanese and English subtitles.
Dictionary
Web
Jisho - Gold standard online Japanese dictionary platform.
Jotoba - Great alternative to jisho.org with improved radical search and more.
Tangorin Japanese Dictionary - Tangorin is an online Japanese-English dictionary with example sentences and many features to help you learn the Japanese language.
Weblio - Japan popular dictionary website without en<->jp, jp<->jp, and more.:jp:
Google Translate - Supports voice and image translation, mobile app supports offline translation.:iphone:
Rikaichamp - Japanese to English/German/French/Russian dictionary. Just hover the mouse on top of a word, and a popup appears. This add-on is more compatible with latest Firefox version and comes with dictionaries files.
Chrome
Yomichan - Yomichan turns your browser into a tool for building Japanese language literacy by helping you to decipher texts which would be otherwise too difficult to tackle.
rikaigu - Rikaikun enhanced. Translate Japanese by hovering over words.
IPA furigana - Looks up the readings for kanji words and inserts them as Furigana.
ReadNihon - ReadNihon generates website Furigana by JLPT level. It also allows you to save known words that are ignored from Furigana conversion.
Toucan - Language Learning - When you visit a website, Toucan automatically translates certain words and phrases on the page into the language you're trying to learn. :iphone: