I think the question says it all. Thanks.
Cream cheese icing is very easy, yummy and pretty much foolproof!https://www.instructables.com/id/Basic-Cream-Cheese-Frosting-with-Flavor-Options/
Just cream cheese, butter, powdered sugar and vanilla.
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powered sugar (icing sugar in UK) and cold water - you don't need much.
Glacé icing, yes I agree, can't get much simpler. Be warned it goes from too stiff, to too runny very easily, so be very mean with the water.
Butter + powdered sugar + a few drops of vanilla or other flavoring + milk Different ratios will give different textures. I usually just go by eye & taste. Start with a stick (4 oz or 120 grams) of butter, blend with 1-2 cups of powdered sugar, then gradually add the liquid until it is creamy and spreadable. A little milk goes a long way, don't add too much at a time or you will have runny glaze rather than frosting.
The kind that comes in a can that sits on the shelf next to cake mixes in the supermarket.