@kanrei best place to learn kanji and radicals is japandict.com you can look up radicals for each kanji there. and romajidesu.com is best place to look up romaji and to learn Japanese, Chinese and Korean at the same time. also wiktionary.com of course for more grammar explanations. these are my three main resources.
Polyglot City is the right instance for you, if you're interested in linguistics, languages, language learning and translating, or if you are multilingual or polyglot. All languages are allowed to flourish on our timelines. And of course you're free to talk about anything else besides languages, too. Make this your personal home!