The picture in my web is not sharp

I use the Blogrow theme.

On line 70-75 in functions.php you will find:

// Thumbnail sizes
add_image_size( 'blogrow-small', 200, 200, true );
add_image_size( 'blogrow-medium', 520, 292, true );
add_image_size( 'blogrow-large', 740 );
add_image_size( 'blogrow-featured', 600, 400, true );

Change those sizes as you wish with a child theme and then run the regenerate thumbnails plugin once: https://www.ads-software.com/plugins/regenerate-thumbnails/

I want to change my social under the column and Why a number of people sharing the web lost. Is there a solution?