I'm still learning kanji along with vocabulary. Since I don't need Japanese for any serious purposes, my method of learning made me able to only read kanji, though I can still write several kanji with not many strokes, but I can mostly only read them. So basically, my method of learning kanji is super simple : As soon as I see a new kanji, I translate it, and then just recognize it later on. After a few times of seeing it you will surely memorize it.
Though, I actually was learning kanji actively for about half a year to get some basic knowledge, back then when I was still a beginner. Now I just decided to go with this kind of a simple method since I never use written Japanese and don't have to know how to write kanji anyway.
For me, Heisig's Remembering the Kanji is the only way I see as feasible for an adult to get some actual results from. I started with this and never regretted it. It isn't for everybody, but certainly worth checking out.
This method is meant as a preparation. It will show you how to recognize and write the kanji, which will prepare you so much better for the studies of readings and usage afterwards.
You can download a "sample", which really is the complete first few chapters to try it out.
I cannot stress enough to read the foreword and his instructions thoroughly. (imo, most of the complaints about the method I came across online so far where from people who obviously hadn't read the instructions...)
⇒ Heisig: Remembering the kanji https://nirc.nanzan-u.ac.jp/en/files/2012/12/RK-1-6th-edition-sample.pdf
Thank you for the great advice, Benjiro.
As far as I watch your introduction video, you sound almost like a native Japanese speaker.
My American friend asked me the same question.
James Heisig is apparently a friend of my business partner.
I'll recommend Remembering the Kanji to the friend of mine.