The core is to burn, to be alight. The simple verb already does double duty: a flame burns, and a runner burns after someone, that is, gives chase. From there the family fans out: the causative lights things up and switches them on, the nouns name the fuel and the blaze, and the adjectives label what is flammable, what is currently burning, and even a person who is "on fire" with enthusiasm. One root runs from a petrol pump to inflammation to a crush. Every word is verified against pealim, niqqud included.
The same root runs through the verb system. Each binyan is a voice: it bends the one idea into active, passive, causative or reciprocal. Tap to hear.
Two binyanim are lexicalized: the simple pa'al (the thing burns by itself) and the causative hif'il (you make it burn, you switch it on). There is no everyday passive partner, so the adjectives below (דָּלוּק, דָּלִיק) carry the "burning / flammable" sense instead of a passive verb.
Same root letters, different noun moulds (mishkalim). The mould tells you the function: who does it, the act of doing it, or the thing produced.
Strip the prefixes, suffixes and vowels. Three consonants remain, and the meaning lives there.