Getting around Amalfi Coast

You definitely do NOT want a car.
The buses can get very full but they are an option, as are cabs.
The best way to get to Amalfi or Maori is by ferry.

https://www.sorrentoinsider.com/en/ferry-schedule

Note that ferries won't run if the weather is bad and Positano has a very small dock so often affected more than other larger towns will be (Amalfi for example is transportation hub with a larger port)

Hi Teresa, we just took the Travelmar ferries from Salerno to Amalfi and later to Positano RT from Amalfi. We also took a bus up to lovely Ravello from Amalfi. We were there last September. We stayed two nights in Salerno and took a train to see the fantastic Paestum Greek ruins. Then we stayed in Amalfi for three nights.

FYI - we lived in Snohomish/Mill Creek for 30 years. : )

We hired Monetti Taxi for the day. They picked us up in a Mercedes van (plenty of room for the 4 of us) and it had big windows. Our driver was Rafael Monetti and he was great. He picked us up from our Sorrento hotel bright and early. He made a point to stop at several scenic spots along the way and he graciously served as our photographer too. He gave us his cell phone number and, when he dropped us off in each town, he told us to call him when we were ready to be picked up. He was always right there waiting when we were. We enjoyed our full day on the Amalfi Coast and I would highly recommend this taxi company. They are mentioned in the RS guidebook too. We made our reservations through email and didn't pay until the day he picked us up.
Side note- during our trip we mentioned how expensive the regular taxis were in Sorrento, especially very early and late. We actually hired Rafael to pick us up the next morning to take us to the train station since we were departing quite early.
All in all, Monetti Taxi was a great help in making our trip a pleasant one.

If you’re staying on the coast, the public transportation (bus & ferry) will suit most situations fine. Yes, they can get very crowded, but the majority or the crowds are day trippers coming from Naples/Sorrento/Salerno. When you’re staying on the coast, you’re mostly moving against the influx of traffic. And late in the day, when everyone is in a panic trying to get back and the roads are gridlocked, you can find a nice place with a view, wait it all out and grab a taxi if necessary.

Keep in mind that there is a single, two-lane road through Positano. Many busses on the road have trouble getting around the mountain curves, so they sometimes stop, and even back up a bit. So even hired cars and taxis get delayed. While you can take a bus to Sorrento, and then the Circumvesuviana to Pompeii, it's a more tedious trip than an expensive taxi. Note that a taxi would charge waiting time if you ask them to wait your four (?) hours at Pompeii.

In late May, when arriving at the Circumvesuviana station for a daytrip, we saw a line for the bus to Amalfi (via Positano) that was more people than would fit on the next, half-hourly departure. Rick (our host) has observed that Sorrento visitors may want to visit Positano first on a bus day, and come home from Amalfi, because the late afternoon bus might skip stopping in Positano (on the way back to Sorrento) if every inch of space on the bus is already occupied. It's possible for ferries to fill up, also. So it might be wise not to take the last ferry of the day, unless you have an advance, timed ticket for that ferry company. The ferries only run in daylight. Here's some bus schedules: (you have to make sure you have the right "season" timetable.

https://www.ravello.com/sita-bus-schedule/

https://www.sorrentoreview.com/sorrento-bus-timetables--guide.html

Some posters here have reported motion sickness on the mountain curves. We also hired a car and driver (from Sorrento) for the day, so I have no information on riding the bus. I did not get motion sickness in our air-conditioned Mercedes sedan.

We stayed in Amalfi and used either the ferries or the Hop on Hop off. It was a little more than the bus but less crowded and more comfortable. Ferries were the best

We stayed in Positano and used the ferries, which worked well for us.

I don't believe the hop-on/hop-off buses on the Amalfi Peninsula are still operating. Check very carefully before planning to rely on those.