Idioms and slang expressions • English Conversation Questions

What is the role of idioms and slang expressions in the English language?
Do you think it is important for English learners to study idioms and slang expressions? Why or why not?
How do idioms and slang expressions differ from standard English vocabulary?
In what situations are idioms and slang expressions typically used?
How can studying idioms and slang expressions help English learners improve their speaking and listening skills?
What are some common idioms and slang expressions that English learners should know?
How can English learners practice using idioms and slang expressions in conversation?
Are idioms and slang expressions culturally specific, or are they used universally by English speakers?
Do you think idioms and slang expressions should be included in formal English language education? Why or why not?
How can English learners effectively learn idioms and slang expressions without causing offense or appearing inauthentic?
What are some common mistakes that English learners make when using idioms and slang expressions?