There are many online resources for learning Kanji. Many years ago, I started with Wanikani, a tool that helps you memorize the meaning of Kanji. Although it did what it promised (and is very addictive!), I noticed that I was focusing too much on recognizing Kanji and neglected studying grammar, conversation and vocabulary. So I chose a less addictive Kanji training method to support my Japanese learning journey, namely the Obenkyo app. 

In the Obenkyo app (Android), you can look up Kanji by JLPT level and find out all the basic information you need to learn about this Kanji. It also has tests that will help you remember them.

Whenever I come across a Kanji I don’t know, I look it up in the WWWJDIC dictionary app (for Android) on my phone. In this app, you can sketch the Kanji and get the meaning, stroke order, and words in which it is frequently used. I have tried many other apps, but I keep coming back to this dictionary.

Then I got to the point where my Kanji knowledge was lagging behind my grammar and vocabulary and I needed to focus a little more on Kanji. I looked at many learning methods, but was never satisfied with the scope of the books as they often focused on a small amount of Kanji. I wanted a book that would last me a long time and I ended up buying a Kanji dictionary that Japanese children use in elementary school. I quite like this book as it helps with immersion and forces me to read Japanese. Also, it is very comprehensive and gives more information than books meant for foreigners. If you do prefer a book in English, check out Kanji Dictionary for Foreigners Learning Japanese 2500 N5 to N1. As you can see, I prefer very complete resources over guided learning methods.