HOW TO REMOVE PAGE/POST TITLE :

For All Pages/Posts:
.post-title.entry-title{display:none;}
Copy The above code and Go to Blogger Dashboard->Template->Customise->Advanced->Add CSS->Then Paste the code->Apply to Blog.
For single Page/Post:
<style>.post-title.entry-title{display:none;}</style>
Copy The above code and Go to Edit Page/post->Then Paste the code->update.