You don't need technical skills in order to contribute here. Be bold when contributing and assume good faith when interacting with others. This is a wiki.
The Wikimedia Commons (this website) only hosts media files with a realistic educational purpose and that can be used for any purpose, including:
use in any work, regardless of content
creation of derivative works
commercial use
free distribution
See Commons:Licensing for the copyright policy on Wikimedia Commons, and Commons:Image casebook for some specific examples. Some other Wikimedia projects have different licensing policies. For example, the English Wikipedia allows fair use of sounds and photographs. This is not the case on Wikimedia Commons; "fair use" materials are not acceptable here.
Please make sure that you only upload educational content you have created yourself, those which are out of copyright, or those for which you have the required permission for the work to be used in all the ways described above. Please note that derivative works of copyrighted material are also considered copyrighted. Again, please read through Commons:Licensing, which is quite crucial, to understanding how Wikimedia Commons works. Thanks for your contribution, and please do leave me a message if you have further questions.
Thank you for your contributions. Your image or other content was recently deleted, or will soon be deleted, in accordance with our process and policies, because it was not, or is not, within our scope. Please review our project scope, but in short, Commons is targeted at educational media files including photographs, diagrams, animations, music, spoken text and video clips. The expression “educational” is to be understood according to its broad meaning of “providing knowledge; instructional or informative”. Wikimedia Commons does not contain text articles like encyclopedia articles, textbooks, news, word definitions and such. Each of these other kinds of content have their own projects: Wikipedia, Wikibooks, Wikisource, Wikinews, Wiktionary and Wikiquote.
If the content seems to fit the scope of one of those other projects, please consider contributing it there. Otherwise, consider an alternative outlet. If you think that the deletion was in error because the contribution really was in scope, you can appeal it at Commons:Undeletion requests, giving a reason why it fits our scope to help others evaluate the matter. Thank you for your understanding.
Wikimedia Commons has an educational purpose, and is not the place to post promotional links or to advertise. Creating articles, userpages, templates, etc. with promotional text is not permitted, nor is the posting of links anywhere on the Commons in an attempt to advertise a website, product, company, person, or organization. Uploading of company logos, press images, and the like in order solely to advertise or use them in promotional material on other wikis is also prohibited, and such images will be deleted if they are found to violate our policies.
Recreation of deleted content or continuing to post links or promotional text or files after this warning may result in a block. Thank you for understanding.