I’m actually having a lot of fun finding patterns (heh) and making up ridiculous stories or inside jokes along with the mnemonics to memorize the radical and/or kanji. It’s pretty clever!
Gotta admit, when I first saw 山, I thought, “Oh! It’ll read as 「やま」right?”
Then I saw 「さん」and I had to remember Kun vs. On reading. Immediately went down a rabbit hole and started reading different articles on kunyomi vs. onyomi
That one is an easy one, it is both, but I mostly remember they call Mount Fuji ’ ふじ 山 fujisan, my friend told me it’s because it has some kind of reverence towards that mountain