Which languages i need to learn for wordpress theme and plugin Devolopement?

Answer 1

Html, Css, Xml, JavaScript maybe even PHP these 're the ones I know

Answer 2

php, MySQL, JavaScript+jQuery, Html, css

Answer 3

Is xml also necessary?

Answer 4

Nessacery depending on plug-in fetutes: html, css Javascript, PHP and possibly SQL. optional XML Jquery.
However for a theme you may only require css and Javascript, although HTML would be useful as without you may need to add elements to the DOM using Javascript.

Answer 5

open WordPress web, view source code, you can inspect the code in there.. yes, WordPress using XML too..

Answer 6

for what Ruby is used