Affinity Photo provides an impressive set of photo editing tools all within one application
Learning to use any photo editing software is a big step, this is true whether you’re new to photo editing or have been using other some other software to manipulate your images, and like anything new, getting used to it takes commitment and practice.
Affinity have resources aimed at helping you get started but you may find it useful to look first at this very useful short beginners video.
One aspect which always divides opinion is how to manage / organise images, often referred to as asset management.
Affinity DOES NOT have an image manager / organiser built in which means you need to work with your operating system’s file manager or use an additional program and there are many free and cheap digital asset management programs available that you can use to organise your photos. Have a look at this site for a very comprehensive review.