[Razengan]

Learning about radicals was a massive Level Up in my Japaneseability.

THey're like protocols/interfaces on OOP classes ^^ or more accurately, like "tele" and "phone" in "telephone", "icon" in "iconography" and obviously many more words in English made up of bits and pieces of other words.

Once you recognize the parts, you'll be able to able to guess/infer what the word means even if it's your first time seeing it. Same with radicals in Kanji.