"A task which can be completed in few days i.e less than a week is generally a tiny task. It could be a bug fix, a simple crud app, a server setup etc. Ofcourse if you have something which takes more time or are not sure, don't hesitate to proceed, that becomes a medium tiny task or a big tiny task :-)"

That's not tiny. Tiny is 1-2 hours work. Tiny is something like changing a hardcoded text string in a codebase or changing something in a properties file.