how can I implement a segmented recycler view

Good evening, I am trying to implement sections in my recyclerview and the info that I find I do not understand :( it is worth noting that I am new to android hehe hope someone can help me or tell me a simple tutorial please I am trying to do something like udemy interface this is my code:

activity main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.hasg_.myapplication.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

/>
</RelativeLayout>

row.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="200dp"
    android:layout_margin="12dp"
    android:layout_height="300dp">
    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</android.support.v7.widget.CardView>

adapter.java

package com.example.hasg_.myapplication;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by hasg_ on 23/01/2017.
 */
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {
    private ArrayList<String> mDataset;

    public MainAdapter(ArrayList<String> mDataset) {
        this.mDataset = mDataset;
    }

    @Override
    public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // create a new view
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.row, parent, false);
        // set the view's size, margins, paddings and layout parameters

        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(MainAdapter.ViewHolder holder, int position) {

    holder.mTitle.setText(mDataset.get(position));
    }

    @Override
    public int getItemCount() {

        return mDataset.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTitle;
        public ViewHolder(View itemView) {
            super(itemView);

            mTitle= (TextView) itemView.findViewById(R.id.title);
        }
    }
}

MainActivity.java

package com.example.hasg_.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private  RecyclerView mRecyclerView;
    private RecyclerView.LayoutManager mLayoutManager;
    private RecyclerView.Adapter mAdapter;
    private ArrayList<String> mDataset;

    @Override
    protected void  onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDataset=new ArrayList<>();
        for (int i = 0; i < 30; i++) {
            mDataset.add("New Title #"+i);


        }
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
            mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter= new MainAdapter(mDataset);
        mRecyclerView.setAdapter(mAdapter);


        }
    }