I have two questions related with subdomain. 1.What will be the effect of subdomain on the main domain? 2.If I developed one website on subdomain and after popularity of that site , I buy TLD and move website there. How can I make sure the pages indexed search engine should point to TLD and my pagerank shouldn't affect? Also, moving subdomain website to new TLD can cause any problem related to pagerank of first TLD on who's subdomain I have developed website.
1. Depends on your purpose for creating the subdomain, also the effect depends on whether you link your subdomain to your main site or not? 2. After the move to new tld, effect on page rank depends on how well you organize your internal linking structure and whether you continue on receive backlinks or not.