The SITA bus stop in Amalfi is located near the shore, right around the traffic circle directly in front of the main roadway Via Lorenzo D'Amalfi leading up towards the higher elevation section of town.
Conventional internet wisdom shares that tickets for the local bus can be purchased at tobacco shops (tabaccheria), newsstands or convenience shops though in Amalfi really the easiest way is to purchase them from the bus ticket salesman. This public transportation worker can be seen sitting at the pergola to the left (west) of the traffic circle, wearing a neon colored traffic vest, often sitting with a few other workers. He'll have a roll of tickets and a small cash box, though he also takes payment by card. Tickets vary by distance, mine to Ravello were €1.50 each way.
My understanding is this salesperson works pretty normal work hours, so wouldn't expect to see him there earlier than 9am or later than 6-7pm, depending on time of year. You can purchase a single one way ticket or multiple tickets if you prefer, no refunds.
Directly to the right (east) of the traffic circle is the main bus stop, which is a partially covered (overhead only) with a few benches. There are bus schedules posted but they're a little complicated to understand, since they show regular and exceptional holiday schedules in the same table, and you have to know what days fall into the exceptional schedule since not all holidays are published. On top of that, they just don't seem to follow the schedule at all, even if Amalfi is the first stop on some routes.
I waited 40 minutes for a SITA bus (route 5110 to Ravello) along with a bunch of other confused tourists. Some people gave up after a while and booked other shuttles which also had QR codes and schedules posted at the bus stop (these have limited seats as well, and they're large vans that cost €7-10 one way).
When the bus eventually came, it took about 25 minutes to drive along the coast, then up some precariously winding roads to get up to Ravello, which overlooks Amalfi and Atrani. SITA bus drivers have mad skills to drive buses--that are almost the size of NYC public buses--up steeply sloped mountains with sheer drops down a cliff on one side.
Inside the buses are pretty standard public buses, decently clean, definitely crowded during shoulder season already so I can't imagine how crazy peak season would be. If buses are full they just won't stop, so that's always something to keep in mind.
Side note: I saw a couple buses stop opposite the main bus stop, on the other side of the parking lot closer to the ferry ticket booths either dropping off or picking up too, though seems like most bus lines stopped on the east side of the traffic circle.
For more info:
https://www.ravello.com/sita-bus-schedule/ read more