Absolutely.

Say "Absolutely" to express that you completely agree with what someone has said.

You can agree with someone's opinion this way.

A: I've always said that you shouldn't hire anyone who you don't feel 100% certain about.

B: Absolutely. I totally agree.

You can also agree to a request:

A: Hey, can I talk to you for a minute?

B: Absolutely.

"Absolutely" sounds even more definite than "yes". You answer "Absolutely" when you're really sure that the answer is "yes".

the war on drugs

The expression "the War on Drugs" became popular in the U.S. in the 1980s, when the president told the country that the government was "declaring war on drugs". It meant that the government would work hard to stop illegal drugs from being sold or used.

Since then, any campaigns by the government or police to stop drugs has been called part of the "war on drugs".

(something) is a waste of (something)

When something valuable becomes lost or ruined, it's "a waste of ___".

Here are some words that you can end the expression with:

Those meetings are a waste of my time.

That sounds like a silly waste of money.

I think that kind of work is a waste of your talent and intelligence.

tax dollars

The phrase "tax dollars" means money that the people of a country paid through their taxes.

People usually use the phrase "tax dollars" when they're complaining about how the government spends this money:

The government is still using our tax dollars to fight a losing war that most of us don't even want to be in.

They need to put more of our tax dollars toward education. 

(sentence), plain and simple.

When you have a strong opinion that you're really sure about, you can end your sentence with "plain and simple."

For example:

To succeed in this world, you have to be a good networker, plain and simple.

Politicians are all liars, plain and simple.

This expression makes you seem very opinionated and aggressive.