Some experienced players can find the game guide on the Internet if they need it. You can complete missions in the game to get Animal Crossing Bells. But this is generally not so smooth. You can grow in the game or trade with others to get the Animal Crossing Bells you need. Of course, there are many ways to get Animal Crossing Bells.
I will recommend an excellent website https://www.mmowts.com/animal-crossing-bells where you can get Animal Crossing Bells. Here you can get a lot of Animal Crossing Bells. On this website you can not only get Animal Crossing Bells, but also many Animal Crossing Nook Miles Tickets. This is a very convenient thing, you should try it.