How to: Create an Article
First things first
Before creating a page on Liquipedia, be it a tournament, player, team, or any other kind of page, the very first step to do is to check that it does not already exist. To achieve that, you can use the Search function to check that the page is not already there on the wiki. Even if you don’t find it immediately, it doesn’t necessarily mean that the page doesn’t exist, as it may have a different name than what you were looking for. Try with acronyms, synonyms, with full names, etc. Search thoroughly. There is no need to do the work twice, plus obviously every entry on Liquipedia must be unique, it will often, if not always, be referenced by other pages. It also should be updated only in one place.
Not everything nor everyone can have its own page on Liquipedia. The Notability Guidelines define what may or may not have an article on Liquipedia. Before creating an entry, you should make sure what you want to create actually satisfies the notability criteria. These are often different depending on the wiki you are on, so make sure your new entry matches the corresponding wiki guidelines. When the notability criteria are not met, the page you created will not be deleted, however it will be moved to your userspace, and visitors to the page will see that the page is not a page curated by Liquipedia.
Forms & Page templates
The wiki is not new, and there are a lot of things that has already been defined so that a specific information is always presented the same way to the wiki’s visitors. If the information is always at the same place in a page, it makes it easier for people to find information across all pages of the wiki. The templates help with that regard, and also make it easier to format information instead of doing the layout by hand. When creating a page, be sure to use predefined template.
These exist for the most common entities on the wiki, like the Infobox template, that comes in three flavours: player, team, league. This template is used all over the wikis and contribute to establish a consistent information layout. So remember to use them. If you have doubts or do not know which templates already exist, a good approach is to inspect the wiki code of a very well known team, tournament or player, as it will most likely contain every possible template you could use for your new page, and always the basic ones. These pages tend to be the most up-to-date and are heavily edited, so what is on it is usually good practice and state of the art in terms of wiki features. Copy/pasting templates is encouraged. And the templates documentation usually provide "copy/paste ready" code to include in your page.
Be wary that the different wikis might not all have exactly the same ways of doing something. If you contribute to different wikis, be sure to do as each wiki does. Templates for example belong to a specific wikis, and even though they are most of the times duplicated between wikis, it might still exist a few differences.
And keep in mind the Preview feature of the editing tools that lets you see your page as it will appear before actually inserting it in the wiki.
The concept behind a wiki is that anyone can edit and/or create pages on it. Sources are what makes it reliable and trustworthy. So be sure to actually provide a link that readers can consult if they want to check that the information is actually true. Though not everything can be sourced, the basic requirement is that you provide, for anything that can have one, a link to a trustworthy source, like the studio that develops the game, a very well established news website, the teams’ websites, etc. Just like in real life, when you say something, people are more likely to believe you if you have a good source to back your statement.
This is a wiki. You can always edit to correct a mistake. So do not hesitate to actually push your modification on the wiki. You should not be worried about committing a modification. Of course, it is better to get it right the first time, as correcting mistakes is additional work, but you should not feel nervous and bad because a mistake may end up on the wiki. There will always be the possibility to correct it afterwards, be it you, or someone else that spots the mistake. We prefer that people contribute and let mistakes slip in, rather than sit out because they are anxious about that. We would like to correct the mistake in that page instead of not having it on the wiki.
Looking for help
The wiki is not only an encyclopedia, it is also a community of active contributors. If you don’t know how to do something, or if what you do is right, ask these people, either on the Liquipedia IRC or in the feedback thread. There will always be someone who already encountered your problem, who can decide if what you do is correct, or who can try to solve with you that problem no one had before. Do not hesitate to share your ideas as well, it is not because you don’t have thousands of edits that you can’t have nice ideas that would improve the wiki!