Albert is a unified and efficient access to your machine. Technically it is a keyboard launcher written in C++/Qt. The plugin based architecture makes it extremely flexible and powerful. Plugins can be used to create modular frontends or native extensions. Extensions can also be implemented using embedded Python modules or via a CGI approach in any language you want. The frontends shipped heavily focus on customizability.
Check the section Installing Albert in the docs for setup instructions. When you are set up take a look at the section Using Albert. If you have problems check the Troubleshooting section. If it does not cover your problems seek for help in one of the chats. Developers may want to check the Extending Albert section.
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Have fun with albert, if you do not, tell me why.