Learn English – What terms I can use to say the something is very easy to do, to learn, etc

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What terms I can use to say the something is very easy to do, to learn, etc?

I have thought about easy-peasy, like "this is easy-peasy to do", or "a piece of cake".

So, in general,

Assembling this furniture is _________ [to do].

Is there a fun/cool way to say that? 
Some slang that is universally understood or something? 
Informal, light-hearted idioms are preferred. 
I don’t want technical bureaucratese
like “This should require only 20 minutes of your time”,
and things like “so easy that a caveman could do it”
seem unnecessarily pejorative.

Best Answer

A walk in the park

something that is very easy to do, and usually pleasant

Easy as ABC

Extremely easy, simple, or intuitive; requiring very little skill or effort.

Easy as falling off a log

To be extremely easy, simple, or intuitive; to require very little skill or effort. After so many years as an accountant, doing taxes is as easy falling off a log for me. Boy, that test was easy as falling off of a log!

Child's Play

A very easy task. Oh please, I've been playing guitar for 20 years—that song is child's play.

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