Welcome to Wikipedia
What is Wikipedia, and why should you care?
You already use Wikipedia. You have probably read an article this week without even registering it. Google something and there it is, first or second result. Ask ChatGPT a question and the answer is built, in large part, from Wikipedia. It is the second-largest source that AI systems are trained on.
Most people think of Wikipedia as that website they used for a school paper once. It is actually the information layer underneath most of what you encounter online. And the part that surprises people: the whole thing is written by volunteers. Not a company. Not an algorithm. People who decide, on their own time, to show up and write.
Wikipedia belongs to a bigger network called Wikimedia. The pieces worth knowing:
All of these share the same principle: knowledge should be free and anyone should be able to help build it. That second part sounds democratic. In practice, "anyone" turns out to be a pretty narrow slice of the population.
Who writes Wikipedia, and who is missing?
Wikipedia has a demographics problem, and it is not subtle.
Content about underrepresented communities and the issues they organize around is frequently thin, outdated, or flat-out missing. Spanish Wikipedia has roughly 2 million articles compared to English Wikipedia's 6.8 million. Many topics with full English coverage do not exist in Spanish at all, or the Spanish version is a two-sentence stub.
The stories exist. The scholarship exists. The journalism exists. The people who know these subjects best just have not been in the editing room.
Consider what happens when that changes. Before WikiLatinos editors got involved, there was no English Wikipedia article on children in immigration detention in the United States. News outlets, researchers, and advocacy organizations had covered the topic for years. But nobody had written the Wikipedia page. So when people searched for it, they found nothing.
A small group of trained editors built that article. Now it exists in the public record. That is what a few people with the right skills and an afternoon can do.
Go to Wikipedia and search for a person, place, or topic from your community. Then search for the same thing on Spanish Wikipedia. Is the article detailed or barely there? Missing entirely? When was it last updated? Whatever you just found (or did not find) is the reason this training exists.
The AI connection
This is the part that makes Wikipedia editing urgent right now.
Large language models, the technology behind ChatGPT, Claude, Gemini, and the rest, are trained on massive amounts of internet text. Wikipedia is one of the largest and most heavily weighted sources in that training data. When someone asks an AI tool about a policy debate, a political figure, or a cultural tradition, the quality of the answer depends, more than most people realize, on what Wikipedia says.
Incomplete Wikipedia article? Incomplete AI answer. Biased article? The bias travels. Article does not exist? The AI improvises from whatever scraps it can find, and the results are usually worse.
The information on Wikipedia today is becoming the foundation for how an entire generation accesses knowledge about the issues that affect our communities. If that information is missing our perspective, the gap gets baked into every AI-generated answer going forward.
A well-sourced paragraph you write this month could show up in thousands of AI responses over the next several years. That is not hypothetical. That is how the pipeline works.
The rules that keep your edits alive
Wikipedia has five core principles. These are not gentle suggestions. Ignore them and your work gets removed. Follow them and your edits become very hard for anyone to challenge.
Not a blog. Not a place for personal opinions. Not somewhere to make an argument, no matter how good it is. Wikipedia collects and organizes information already published in reliable sources. Your job is to surface what is documented, not to make new claims.
Articles represent all significant viewpoints, weighted by the reliable sources behind each one. Neutral does not mean "both sides are equally valid." It means you present the evidence and let readers draw their own conclusions.
Writing about a contested policy issue in a particular state? You describe the legal status, the relevant context, and the political positions, all from published sources. You do not add your own commentary. This feels limiting at first. In practice, it is what gives Wikipedia its credibility, and it is what makes your edits stick.
Every claim needs to trace back to a published, reliable source. Personal knowledge, even when accurate, is not enough. If you cannot point to a book, article, paper, or government document backing up what you wrote, anyone can remove it.
The flip side: well-sourced content is extremely hard to delete. The more citations you add, the more durable your work becomes. Citations are your best protection.
You cannot publish your own analysis, theories, or unpublished findings. You also cannot stitch together sources to build a conclusion none of them individually support. Your role is to summarize and organize what reliable sources have already said.
You will encounter people who disagree with your changes. Disputes get resolved through conversation, not through repeatedly undoing each other's work. Wikipedia calls this "Assume Good Faith": start from the assumption that other editors are trying to improve the article, even when you disagree. It does not mean you have to agree. It means you talk it out.
How people work together on Wikipedia
Even when you are editing alone at your laptop, you are part of a system with thousands of other editors. Knowing how the community works will save you a lot of unnecessary stress.
Bold, Revert, Discuss. This is the rhythm. You make an edit. Someone disagrees, they might revert it, meaning they undo your change. This is not personal. It happens to everyone. When it happens, you go to the article's Talk Page and make your case. Explain what you changed, cite your sources, work toward something both sides can accept.
Talk Pages are where the real decisions happen. Every article has one. Think of it as a structured conversation space where editors negotiate what the article should say. It is the one comments section on the internet that actually works, because there are norms and moderation.
Edit summaries matter. Every time you save, Wikipedia asks for a short note about what you changed. Always write one. "Added citation for 2024 state policy change, source: AP News" builds trust. A blank summary or "updated" makes people wonder what you are up to.
Politically sensitive topics get extra scrutiny. Articles about contested policy issues attract editors with strong opinions. Your best defense is always thorough sourcing. When your work is well-cited and follows the five principles, removing it becomes very difficult to justify.
What comes next
This module was the groundwork. Here is what the rest of the training covers:
By the end of all six modules, you will know how to find articles that need work on issues you care about, improve them with accurate information, navigate Wikipedia's rules, and handle pushback when it comes.
Next up: creating your account. In the meantime, spend a few minutes on wikipedia.org. Search for things you care about. Pay attention to what is there and what is not.
Module 1 complete
You have the foundation. Next, you will create your Wikipedia account and learn how to protect your identity while building your editing presence.
Start Module 2