Mutual Aid as a concept was first broached by Peter Kropotkin in 1902 (although the concept is older than that.) in a book of Essays called Mutual Aid: A Factor in Evolution.

Mutual Aid: A Factor of Evolution is a 1902 collection of anthropological essays by Russian naturalist and anarchist philosopher Peter Kropotkin. The essays, initially published in the English periodical The Nineteenth Century between 1890 and 1896,[1] explore the role of mutually beneficial cooperation and reciprocity (or “mutual aid“) in the animal kingdom and human societies both past and present. It is an argument against theories of social Darwinism that emphasize competition and survival of the fittest, and against the romantic depictions by writers such as Jean-Jacques Rousseau, who thought that cooperation was motivated by universal love. Instead, Kropotkin argues that mutual aid has pragmatic advantages for the survival of human and animal communities and, along with the conscience, has been promoted through natural selection.

Mutual Aid is considered a fundamental text in anarchist communism.[2] It presents a scientific basis for communism as an alternative to the historical materialism of the Marxists. Kropotkin considers the importance of mutual aid for prosperity and survival in the animal kingdom, in indigenous and early European societies, in the medieval free cities (especially through the guilds), and in the late 19th century village, labor movement, and impoverished people. He criticizes the State for destroying historically important mutual aid institutions, particularly through the imposition of private property.

Many biologists[3][4] (including Stephen Jay Gould, one of the most influential evolutionary biologists of his generation) also consider it an important catalyst in the scientific study of cooperation.[5]

He argued against Darwin’s “survival of the fittest” theory, and this has become somewhat of a tenet among anarchists.

You can buy a beautiful copy of it here: https://blog.pmpress.org/authors-artists-comrades/peter-kropotkin/#mutualaid

Get a free copy here: https://theanarchistlibrary.org/library/petr-kropotkin-mutual-aid-a-factor-of-evolution

Or buy it on B&N:https://www.barnesandnoble.com/w/mutual-aid-peter-kropotkin/1101158703?ean=9780241355336

Also there’s a new book titled Mutual Aid by Dean Spade.

Around the globe, people are faced with a spiralling succession of crises, from the Covid-19 pandemic and climate change-induced fires, floods, and storms to the ongoing horrors of mass incarceration, racist policing, brutal immigration enforcement, endemic gender violence, and severe wealth inequality. As governments fail to respond to—or actively engineer—each crisis, ordinary people are finding bold and innovative ways to share resources and support the vulnerable. 
Survival work, when done alongside social movement demands for transformative change, is called mutual aid.
This book is about mutual aid: why it is so important, what it looks like, and how to do it. It provides a grassroots theory of mutual aid, describes how mutual aid is a crucial part of powerful movements for social justice, and offers concrete tools for organizing, such as how to work in groups, how to foster a collective decision-making process, how to prevent and address conflict, and how to deal with burnout.   
Writing for those new to activism as well as those who have been in social movements for a long time, Dean Spade draws on years of organizing to offer a radical vision of community mobilization, social transformation, compassionate activism, and solidarity.

You can get it wherever fine books are sold. https://www.barnesandnoble.com/w/mutual-aid-peter-kropotkin/1101158703?ean=9780241355336

Here’s him talking about it, and organizing.

Mutual aid is the radical act of caring for each other while working to change the world.

Organizing is what mutual aid is about, and it’s easy to do. You can just help your neighbor with a project, that is mutual aid. (The Amish know how to do this.) Start, or contribute to, a community garden, or a community tool share. Small things as well as big things.

Here’s a link to Mutual Aid Disaster Relief, which is helping in the wake of the devastating hurricanes, down south.

I’m going to close this here, I think I’ve given plenty of links to get you started with this. Good luck.

Solidarity not charity.