Starting with Sitecore Analytics MongoDB API

I see a lot of questions about how to start using it, so this is a short post about.
For example let's get all Visits data for the last month (last 30 days) for our particular site. First of all we need to get the MongoDB collection named "Interactions" it has all Visits data:

//Connecting to the Analytics DB
var driver = Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbDriver.FromConnectionString("analytics");

//Building our query
var builder = new QueryBuilder();
var filter = builder.And(builder.GTE(_ => _.StartDateTime, DateTime.Now.AddDays(-30)), builder.EQ(_ => _.SiteName, siteName.ToLower())); 

//Retrieving data from the "Interactions" collection
var interactions = driver.Interactions.FindAs(filter)

In similar way you can get other data.

That is it!