How to make or find advanced UI assets

Hello Everyone,
Anybody knows where to find or how to design advanced UI assets like :

  • search box
  • browser
  • slider bar to browse a list
  • popping-up keyboard to type in searchbox
    ?

Each of my google requests drive me to how to use Unity own interface…

As a newbie, I didn’t see that many UI assets are already available in Unity.
Just click on “GameObject” Tab → “UI”, all is there…
The “Survival Shooter” tutorial is a good start to figure out how to manage some of these assests.
I’ve also found useful free assets in Asset Store like “Game Jam Menu Template” and “Unity Samples: UI”.
Good luck !