Anarchy by Malatesta.

It really doesn’t get much better than that when it comes to short introductory anarchist essays.

https://lburlamaqui.com.br/wp-content/uploads/2021/02/Colin-Ward-Anarchism_-A-Very-Short-Introduction-2004-Oxford-University-Press-USA.pdf

If you want a short intro, then some of Goldman's and/or Kropotkin's essays might be a good starting-point:

http://dwardmac.pitzer.edu/Anarchist_Archives/goldman/aando/anarchism.html

http://dwardmac.pitzer.edu/Anarchist_Archives/kropotkin/britanniaanarchy.html

Both are very "red" anarchists; neither addresses "green" anarchism in their intros, and Kropotkin is dismissive towards market socialist forms of anarchism.

Two articles on anarchist history I like and you may find useful:

• Anarchist Unionism: A Forgotten but Glorious History: a summary of anarchist labor movements across the world. Anarchism was the major revolutionary ideology in the world prior to the Russian Revolution, and anarchists organized and led many of the world's major labor unions.
• Towards a History of Anarchist Anti-imperialism: A short overview of the some of the anarchist anti-imperialist movements, like Kim Chwajin and the Korean Anarchist Federation's uprising against Japan, anarchism's predominance in the Mexican Revolution, and others. A longer read going off this might be Anarchism and Syndicalism in the Colonial and Post-Colonial World.

I always recommend the introductory topic on the library, which currently has 285 texts listed:
https://theanarchistlibrary.org/category/topic/introductory

Within that topic, I would recommend:

Life Without Law by Strangers in a Tangled Wilderness Collective
https://theanarchistlibrary.org/library/strangers-in-a-tangled-wilderness-life-without-law

Anarchy Works by Peter Gelderloos
https://theanarchistlibrary.org/library/peter-gelderloos-anarchy-works

Anarchy 101 edited by dot matrix
https://theanarchistlibrary.org/library/anarchy101-org-anarchy-101

Anarchy 101 by Bob Black
https://theanarchistlibrary.org/library/bob-black-anarchy-101

"The State is Counterrevolutionary," by Daniel Baryon. https://theanarchistlibrary.org/library/anark-the-state-is-counter-revolutionary

"'Read On Authority'," by JudgeSabo. https://theanarchistlibrary.org/library/judgesabo-read-on-authority

These texts are rather lengthy; reading them requires multiple days. But it's completely worth it.

anarchism.crd.co gives a pretty good overview that might be what ur looking for

Are you a teacher or a student?

"Another Brick In The Wall" is good, I watched it while in teacher's college while on shrooms.