When i want to savagely knock my opponent out what combinations should i use, give me some really wild combos
Learn how to all the key punches, and then decide which ones are gonna work when you're in there. You need openings for combinations to work, and most openings are gonna be open all at once. If you're not creating them yourself, the specific openings for a four punch combination all being open one after another is really rare, and will be an anomaly. So work with what's in front of you, or get really, really good at creating the same set of openings for your favourite combo. For example, learn how to create space for uppercuts if you like them, then take note of what most conventional fighters leave open, then work from there. If you can't be arsed with all that, I recommend the good ol' 1-2-3.