Could you please provide me some sample examples on sightly in AEM6??

The documentation can be found here:

• http://docs.adobe.com/docs/en/aem/6-0/develop/sightly.html
• http://docs.adobe.com/docs/en/aem/6-0/develop/sightly/use-api-in-java.html
• http://docs.adobe.com/docs/en/aem/6-0/develop/sightly/use-api-in-javascript.html

Also, there are several blog posts on that topic:

• Sightly intro part 1
• Sightly intro part 2
• Sightly intro part 3
• Sightly intro part 4
• Sightly intro part 5: FAQ

And in AEM, you can have a look at following content:

• Page built with Sightly: http://localhost:4502/content/geometrixx-outdoors/en/activities/cajamara-biking.html
• Sightly Geometrixx page component: /apps/geometrixx-outdoors/components/activities_page
• Sightly foundation components: /libs/wcm/foundation/components

Finally, there are also some slides on the topic:

• http://www.slideshare.net/GabrielWalt/component-development

(I've updated this post to take in account all other replies, thank you everybody for your useful answers!)