Shaving tips???

Okay, I need tips on how to get smooth skin after shaving my legs and my armpits, because no matter what, I seem to be left behind with bumps, small hairs still left behind, and red blemishes… it’s so frustrating! I do pat my legs dry, and apply lotion, but I’m not sure if I should be putting anything on my armpits? I usually just apply my deodorant per usual, but let me know!!!!