what is xml mainly used for and plz suggest some good forums to learn xml

Question

i mean how to use xml how to write codes and anything which you guys want to share about xml
PLZ SUGGEST SOME GOOD FORUMS TO LEARN XML.

Answer 1

From intro to outro:
https://www.w3schools.com/xml/

Answer 2

XML is use in many way, it become convinient when you mix many languages, webservices, applications together and you want to get a common language that every part of your app can understand.
It can be use as simple database but also inside config files to build a view depending on variables it contains for example.

Answer 3

I often use it and I can say that except declare the encoding, know how to build a node ( 5s to learn), add attributes on nodes (5 more seconds), know that you can write nodes inside nodes (<5s) and to finish know about CDATA (ok 10s)... not too many things to know.
The complex is not about how to write it but how to read it from others languages.