When you open a new connection for `mongosh` from your terminal you will find really useful the following commands:
First of all, connect to a server:
mongosh "mongodb+srv://{MONGO_COLLECTION_USER}:{MONGO_COLLECTION_PASSWORD}@{MONGO_APP_NAME}.yng1j.mongodb.net/?appName={MONGO_APP_NAME}"
Then the basic commands to start interacting (the most of them are little obvious):
// show databases
show dbs
// use database
use <db_name>
// show collections
show collections
// finally interact with them, for example
db.users.findOne()