New feature alert!
Recently, YouTube updated its mobile app.
Basically, now you have a new dedicated tab for Shorts - second from the left. YouTube replaced an Explore tab, which was there before.
If you click on a new Shorts tab - there will be a YouTube Shorts player.
To navigate in YouTube Shorts player, just scroll up or down - and you will discover new Shorts videos.
Where is the old Explorer tab?
You can find old Explorer in the top left corner of YouTube app.