Hide folder and media in Android without any app

There are many apps available in Play Store to hide media such as images and videos.
 But how to hide folders and media files in android without any software .
Only a file manager is needed for this purpose. In my case i use ES File Explorer.

There are three ways to do it.
1 - By adding .(dot) in front of folder name. 
      Open file explorer and find your folder which you want to hide.
      For exp we have folder named video . To hide this folder we simply rename  it to.video and its done .
2 - By creating  .nomedia file.

      With this technique media scanner will not scan media within foder and media from that foder don't  shown in gallery. Open the folder which contents you want to hide . Create new file and name it .nomedia . It's done.

3 - By changing the format of file.
     This is more secure way to hide any media file.In this way media scanner doesn't reconize file type whethere it is video, audio, image or text file. for exp a video file which name is video.mp4 simply rename it to video.mp4.sln or anythig you want.