I have some doubts regarding my laptop maintenance. Where can I ask such types of question?
If your question is a product recommendation/shopping question(Ex: Which processor should I buy etc) then it's offtopic for Super User and throughout the network.
For starters, have a look some of the booting related questions and search before asking. And mention your problem clearly, not just
Ask it on http://superuser.com.
From the FAQ:
Do check out the rest of the FAQ though; keep the question reasonably scoped.