get page title 2c excerpt or content by id

1<?php 
2$var_name = get_post('1'); // here 1 is id of the page.
3
4echo $page_title = $var_name->post_title;
5
6echo $page_excerpt = $var_name->post_excerpt;
7
8echo $page_content = $var_name->post_content;
9?>

1<?php 
2$page_name = get_page_by_title( 'About' ); // here About is page name.
3
4
5echo $page_title = $page_name->post_title;
6
7echo $page_excerpt = $page_name->post_excerpt;
8
9echo $page_content = $page_name->post_content;
10?>