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How to display all child records in parent object

I want to display all child records on parent detail page ( when I open the parent object  it show  all child records and how many records are in child) use apex code, please help on this I am new to coding side, I really don't know how to do please any one help me in simple steps 
Raj VakatiRaj Vakati
Following links are having solutions for you. 

https://salesforce.stackexchange.com/questions/137584/display-child-records-for-specific-parent-on-a-visual-force-page
http://sfdcsrini.blogspot.com/2014/08/how-to-open-child-records-list-from.html
http://www.sfdcstuff.com/2017/01/customizable-visualforce-component-to.html