Criteria A. Skills, Processes, and Techniques is worth double the amount of points than all other criteria in the PP.
For this criteria you should show:
Drawings
Sketches
Designs
Preliminary Paintings
Studies
Photographic Contact Sheets
Computer Screenshots
Experiments with Materials
Records of Sculptural Processes
Basically, the artistic process behind how you are completing your artwork. This shows up on every screen, meaning it often overlaps with slides of other criteria (for example B. Critical investigation might show how you were influenced by another artist's techniques and show how you experimented with that, C. Communication of intentions will explain why you are completing the work and what it means, but also show brainstorms and sketching. D. Will reflect on your process, while you show pictures of your process for A. This is why it is worth so many points.
This criteria also is where the PP Art Forms Table shines, ensuring you are working with a variety of media.
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At the highest level on the rubric:
"The work demonstrates assured and sustained experimentation and manipulation of a range of skills, techniques and processes, and a highly appropriate selection of materials, consistent with intentions."
Skill is akin to mastery of a craft. Skills when well practiced translate to visually pleasing works. You can show skills by showing practice- whether that be sketching, trying out different compositions in photography, or trying out a new ceramic method. You could also show progress here, the before and after of gaining and honing your skills.
Process is showing your thought process and choices that you are making to help fully express your idea. This can also mean step-by-step progression but be careful not to get confused by process vs. progress, it is much more helpful to an audience to see what's hidden in your thought process/planning/how your artwork came to be.
Techniques are what are practiced to develop skills, they are quite similar but for technique is helpful to show practices with materials, media, etc. How do you hone your brush work? Color mixing? How can you show how you carved your pot? How can you show experimentation with lens based media?