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Ashritha ReddyAshritha Reddy 

can any one explain below best practise?

Hi how can we acheoeve the best pracice of visualforce page through these?
Accessing component IDs
Page block components
Rendering PDFs
Using component facets 
  plese give me over view very urgent?
NagendraNagendra (Salesforce Developers) 
Hi Ashritha Reddy,

Please find the best practices in the below links

Accessing component IDs-https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_best_practices_accessing_id.htm

Page block components-https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_additional_pageblocksectionitem.htm

Rendering PDFs-https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_additional_render_pdf.htm

Using component facets-https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_additional_facet.htm

Please mark my solution as the best answer if it helps you.

Best Regards,
Nagendra.P