I don't get the spell slot system for D&D 5e's Warlocks

I don't get the spell slot system for D&D 5e's Warlocks warlock spell slot The Pact Magic table shows how many spell slots you have to cast your warlock spells of 1st level and higher To cast one of these warlock spells, you must warlock spell slot I'm confused about how warlock spell slots and every other spell slot interact I get how they operate in their own classes, but sometimes

warlock spell slot The premise of the Best Warlock Fiend Build is simple, Hex and Eldritch Blast repeatedly You leave your spell slots for Hellish Rebuke, which will provide a

warlock spell slot table Spell slots are the fuel you spend to cast spells For now, think of cantrips as being totally separate from spells  Warlocks do not cast spells through the Spellcasting feature, but through their unique Pact Magic feature Spell slots granted by Pact Magic are