Either I've missed it or there's no clear information about that topic.
Where should I look for Perl 6 libraries? CPAN.org? Or only http://modules.perl6.org?
When I've chosen one, how can I add it to my Perl 6 project?
If I find it on GitHub, how can I add it to my Perl 6 project?
Please make sure to read @smonff's answer as well for responses to questions 2 and 3.
- Where should I look for perl 6 libraries?
- When I've chosen one, how can I add it to my perl 6 project?
Use zef to install it on your local system.
Read the modules doc page for directions on use
ing a module in your project.
- If I find it [somewhere], how can I add it to my perl 6 project?
If zef can see it (and zef will usually be able to see a module if its repo is listed at modules.perl6.org) then zef should be able to install it. If not, contact the author or ask about it on #perl6.