Everyone learns differently. Being an inexperienced ignoramus myself I found it a struggle to wrap my head around editing and workflow. I never used anything like AP or photoshop before. I do have lightroom 4.
An odd thing that helped me to understand actual workflow came from the video editing industry. It may not be useful to your education but it helped me grasp the photo editing workflow:
1. Davinci Resolve https://www.blackmagicdesign.com/products/davinciresolveIf you scroll down to the bottom of the page you will see a free version for download.
2. This guys free Resolve tutorials http://filmsimplified.com/courses He has a lot of paid tutorials for film makers but his free classes were enough for me to grasp the idea of an editing workflow. The tools are obviously wrong for AffinityPhoto but the concept of workflow is what they helped me understand. (besides, most modern cameras come with video capability so you might need it one day).
3. Same guy, (Alex Jordon). This is his youtube channel https://www.youtube.com/user/LearnColorGrading/featured.. Most of the channel is advertising for his classes but he has a lot of short tutorials that I found very helpful.
Apologies if this is way off topic but being a noob and knowing this helped me (in an odd way) to understand the editing and workflow process, I will throw it out there for others who might be struggling.
Edit: Forgot to mention. When he talks about nodes just replace that word with layers, it will make sense then :)