Bayonetta's bread and butter is Heel Slide > (Uptilt > Fair 2 ) > Witch Twist > Afterburner Kick x2 > Bair/Uair, with the moves in parenthesis being situational moves that slightly increase the damage of the combo but can be skipped. This works a few times, and from there you have to rely on small combos like Dtilt > Uair and whatever you can find. It's hard to get a Heel Slide in since its very predictable, but finding openings on your opponent is not as hard since the move is kinda fast and the second hitbox messes with people, especially if they have shitty frame data or try to punish with a stronger attack.
Witch Twist comes at like frame 4, its one of your fastest moves and can be used to avoid getting punished since it hits both sides. Its also a combo starter so its not a bad idea to throw it out when you feel in danger just remember your lag increases every time you use upB or sideB.
For kills, your best option is to go for Witch Time, and by now im sure everyone understands how difficult it is to get a counter through. If you do get one, make sure you hit your opponent or repsition yourself with a roll to avoid getting hit by multihit moves. Getting hit during Witch Time cancels it, so watch out. Remember that your Smash attacks don't deal much damage, so you'll notice that many moves will be able to clash with them and completely nullify them, which is why i recommend going for a dtilt and then charging your usmash or dsmash. Outside of Witch Time, Uair and Bair can kill when close to the blast zones, and fthrow can kill at very high percents when near the ledge. If you want to get earlier kills without Witch Time, you need to make reads. Your Smash attacks are huge, especially Fsmash, which can easily punish air dodges at a distance. Some attacks like Fair 1 or SideB 1 can combo into Fsmash if they miss the tech. For some reason people are mashing shield after they get hit by Side B, so if the second move whiffs, just Fsmash and you will probably hit them. Other than that, you can do perfect pivot fsmashes on opponents that try to attack you from above. They will land with a move while you step away from them and fsmash them during landing lag. Another kill move you have is Dair. This is actually one of Bayonetta's best moves. The move spikes opponents and creates a shockwave when it lands, the shockwave having tremendous launching power. Off stage, face away from your opponent and Dair them as they approach the stage. The move will either spike or stage spike, and then you can witch twist + jump to safety.
Bayonetta is not as hard as people say, but she's also not an easy character to play, especially when DI and SDI exist, ruining her combo potential. With practice you'll be able to pull off her basic combos to rack up damage but the hardest part is actually killing. It's still has barely been a week so im sure we'll be seeing more bayo techs soon.