A back-heavy kick into the Spiral Arrow is Cammy's easiest and most effective combo. Use this to push the opponent back and trap them in the corner for follow-up attacks. However, note that the initial part, the back HK, is -7 on the block. So, it's best to poke in advance and go for it only if there's an opening.
I also like to use for dr cancel. Cr.hp-st.hp-hk spiral arrow, okay damage, amazing oki. (Maybe not optimal, but very reliable, which is important, you dont lose alot of dmg)
Wiff punish combo, st.hp - hp spinning knuckle- st lk - mk spiral arrow (cannon spike in corner). Great for not spending drive gauge, great for shimmies, very satisfactory to hit.

Fishing buttons, st hp- buffer dr. In neutral to catch wiffed buttons / cr.mp its a great button to walk back and try to contest a shimmy attempt, also great for stopping random neutral dr from the opponent.

Buffer button, cr.mp. pretty safe to do if you are good at spacing, great to manage drive gauge. Stop dashes, etc.

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