Task: I want all my latest photos at a same place , create a album named as plant Image and add the first five pictures to the album in the Gallery app . 
Steps:
open the photos app
Click on the First pic 
Click on the second pic 
Click on the third pic 
Click on the four pic 
Click on the five pic 
Click on the + icon at the bottom of the screen
Click on the Album option of the screen 
Enter a title name as plant Image
Click on the tick icon at the top left corner of the screen