Outliner helps you gain a quick overview of everything that you have on your scene. You can find it by going to ‘Window + Outliner’. On your outliner there is a search bar where you can actually search for any specific models that you have in your scene. To hide any models you can select it then hit the ‘H’ Key. To group an item you press ‘Control + G’, this helps you organize your models into groups. This also allows for you to select multiple models at the same time so you can move, scale, or rotate them simultaneously. To only see the active models on your outline you can click on ‘Display + DAG Objects Only’, This can help make your outline less overwhelming.
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Abraham’s Blog 