Show Post of certain category:
Step 1 : Go to Dashboard(admin section) and Navigate to Appereance > Customizer > Homepage Settings > Home Page top section.
Step 2: Choose category in “Choose Category” section.
Show individual posts:
Step 1 : Go to Dashboard(admin section) and Navigate to Appereance > Customizer > Homepage Settings > Home Page top section.
Step 2: To use individual posts check to use individual posts.
Step 3: In post one select the post to display left part (big image). Select the posts from two to five to display in right side (small images).