Creating a method calling an async method, but the calling method isn't async itself, though returning a Task, but how does it work?

I've watched a video of a person creating a non async method that calls an async method but doesn't use the async/await keywords to do so, and I'm confused.

Here's the code:

1 - This is the async method he created first

public async Task SaveData<T>(
        string storedProcedureName,
        T parameters,
        string connectionString = "Default")
    {
        using IDbConnection connection = new SqlConnection(_config.GetConnectionString(connectionString));

        await connection.ExecuteAsync(
            storedProcedureName,
            parameters,
            commandType: CommandType.StoredProcedure);
    }

2 - This is the method calling the above method, without being async

public Task InsertUser(UserModel user) =>
        _db.SaveData(storedProcedureName: "dbo.spUser_Insert", new { user.FirstName, user.LastName });

I don't understand how you don't need to have the async/await keywords there for the InsertUser method knowing that a Task should be awaited in order to be used right ?

You need to declare a method async if you want to use await within that method. Your SaveData method returns a Task. If you want to await that method when you call it then you can only do so in a method declared async. await will wait until the returned Task completes and then unwrap it. Your InsertUser method is not using await so it doesn't need to be async. It will just return the Task immediately and not wait for it to complete. That means that that Task can be waited on further down the call stack or it can just be allowed to carry on in parallel and ignored if there's no need to know when it completes.