Process:
https://thenounproject.com/search/?q=process&i=363475
Constraint:
https://www.vectorstock.com/royalty-free-vector/constraint-icon-simple-element-vector-27077967
Invariant:
https://thenounproject.com/term/constant/239044/
Patterns of Reasoning:
https://thenounproject.com/term/pattern-lock/993151/
Insight:
https://www.pngitem.com/middle/wiwTw_data-insight-icon-png-transparent-png/
Crawl:
https://thumbs.dreamstime.com/z/crawling-man-icon-flat-design-gray-color-symbol-modern-ui-web-navigation-sign-illustration-element-crawling-man-icon-flat-design-114966254.jpg
Walk:
https://thenounproject.com/term/walk/709031
Run:
https://upload.wikimedia.org/wikipedia/commons/b/b0/Running_icon_-_Noun_Project_17825.svg
Analytical Reasoning:
https://s3.amazonaws.com/wj-cdn/uploads/aba2a20d6675bb1f8333eff5027c9760
Use the top image on the D section
Visual Model:
https://icons8.com/icon/55808/3d-model
Pricing Section:
book:
https://stock.adobe.com/search?k=%22book+icon%22&asset_id=190506160
course:
https://www.freeiconspng.com/img/15341
coaching:
https://www.123rf.com/photo_111338969_stock-vector-coaching-icon-coaching-symbol-design-from-human-resources-collection-.html
community:
https://thenounproject.com/search/?q=community&i=2522271
Problem Classification
https://thenounproject.com/search/?q=classification&i=1705417
Never Get Stuck
https://thenounproject.com/term/wall/1171258/
https://thenounproject.com/search/?q=maze&i=369013
Over 200 Problems
https://thenounproject.com/term/quantity/2463381/
No Memorization Required
https://thenounproject.com/search/?q=memorization&i=544757
https://thenounproject.com/term/wrong/539385/
Stand Out from the Crowd
https://thenounproject.com/search/?q=community&i=199749
Inductive and Deductive Reasoning
https://thenounproject.com/search/?q=reasoning&i=3239961
Practice:
https://s3-eu-central-1.amazonaws.com/glossika-blog/2019/05/use-deliberate-practice-to-learn-foreign-languages.png
Use the rightmost diagram. Remove all the texts in this diagram.
Theory
https://thumbs.dreamstime.com/z/atomic-theory-icon-filled-thin-line-outline-stroke-style-vector-illustration-two-colored-black-atomic-theory-atomic-180544804.jpg
Use the rightmost image.
Drills
https://thenounproject.com/search/?q=exercise&i=3507234
Analytical:
https://thenounproject.com/search/?q=deductive&i=79239