Well to start off
kanji is the Japanese word for the
simplified Chinese writing system Hanziwith that said you have to now take in the fact
hiragana and katakana are both in a way romanized and
romaji is what should be avoided if you can as most native speakers usually do as they don't study the alphabet lol but that's more obvious...
keeping this in mind now Chinese is tonal language there for kanji is as it's really just simplified hanzi instead of traditional which takes more time to write...
alright so how to memorize? start of with the ones that
look like the objects you are familiar with they are not hard to find as almost all are... the best thing i can tell you is practice drawing it.
the ones that are really good example bellow
Kitree
as you can see it's logical in a way you add a tree to change the meaning to a larger "tree" in a way a lot of kanji are like this
though like in china where you go one place and the word is said one way and in another place another said another, this is where you don't learn Chinese and how you say it but just how it's written.