Since D7 came out, many are skeptical about how easy it is to manage media types and files. What if we want to make a gallery for only images or a gallery of videos? What modules are best to use to make this job simple?

Some modules needed to make simple image galleries for D7 are already part of core: Image cache as Image styles, CCK as fields, and views. To make the gallery more robust, follow these steps:

1. Install the media module to manage all files accessible at /admin/content/media
2. For a lightbox gallery, install colorbox. It has views integration as well as a colorbox trigger where you can make any fields pop up into a lightbox easily.
3. For a video gallery, install videojs, an html5 video player. This module makes sure that the video is playable in all browsers.
4. To easily add videos from youtube, download an add-on called media youtube.
5. To make the videos UI display like how youtube does, install views slideshow.
6. Putting it all together, create a new content type called gallery or videos. Add an image/video field and a thumbnail for the video.
7. Make a new view called gallery using the type above. If we want a lightbox type of gallery:
   1. Add the fields you want to be displayed in the gallery and exclude all of them.
   2. Add the colorbox trigger in the field > Replacement Patterns and include the thumbnail as the trigger, the entities (ex: video field, image field, description) on the popup and the title on caption.
   3. The width and height will need to be tested depending on how much content is placed on the popup and theme.
   4. Add views paging, and sorting if you want and save. Now you have a simple image/video/mixed contents gallery.
8. For a video gallery with slideshow or to get it close to Youtube UI:
   1. Add the fields you want to display in the slideshow and exclude all of them.
   2. Add the global custom text > Rewrite > Replacement patterns and include the title and entities (ex: description, extra fields).
   3. On Style Settings of the view, click on Slideshow then its gear.
   4. For slideshow settings, make slideshow type as cycle and choose the effect transition.
   5. Click on View Transition Advanced Options:
      1. To make it auto rotate, make timer delay have a value more than 0 (preferably 5000)
      2. To make it like Youtube UI, make timer delay = 0.
   6. Make sure Sync is checked, Pause on hover, Pause on click.
   7. To have paging like Youtube, on Top Widgets, click on Pager > Weight of Paper = 1 > Pager Type = Fields > Pager Field = thumbnail image.
   8. To have optional controls (play, pause, previous, next), check control > Weight of control = 1 > Control type = text.
   9. Add views paging and sorting if you want and save.
9. All of these require css tweaking to make it look nice and match your theme.
10. Populate the contents and voila, now you have an all in one media gallery.