The idiom "as simple as that" is used to describe a situation or task that is very easy to understand or complete. It can also be used to indicate that something has been resolved quickly and easily.

The idiom "wide berth" means to give or allow someone a lot of space, freedom, or room for maneuver. It can also mean treating someone with respect or deference.

• I gave my colleague a wide berth during the meeting because he was new and nervous.

"In a fog" is an idiomatic expression that means being confused, uncertain, or unclear about something. It can also refer to a situation where things are not clear or straightforward. Example sentences:

• I'm in a fog right now about what to do for my career.

The idiom "castles in the air" means to plan or daydream about something grand or elaborate that is unlikely to happen in reality. It can also mean making promises or plans without any intention of fulfilling them.

The idiom "mad at" is used to describe extreme anger or fury towards someone or something. It can also be used to describe a state of being angry, irritated, or upset.