Where do I report bugs/problems with Valve's Steam?

I have a problem with Steam or one of it's games, how do I report this to Valve?

Solution 1:

According to Valve:

If you encounter an issue while using Steam for Linux or with any of the available Linux games, first search the issue list to see if it has already been reported. Include closed issues in your search.

If it has not been reported, create a new issue with at least the following information:

• a short, descriptive title;
• a detailed description of the issue, including any output from the command line;
• steps for reproducing the issue; and
• your system information.

• List of existing issues
• Link to file a new issue, you will need a github account.