How can I make a page created be editable only by user that created the page?

Question

I have created 2 users. Page created by user1 shouldn't be editable by user2. Also in Administer->content section, each user can view only his own content.

Answer 1

By default in Drupal, the only one that can edit a node is it's creator and those that have administer content. Most likely you have given your users that permission, which enables them to edit all content.

If that is not the case, then you have installed one of the access control modules, which gives your users the ability to edit content they haven't created.