Kindergarten: 20 skills.

Indented means “needs the one above it first”. A skill with no indent starts from earlier grades.

Comparing length & weight CCSS-M K.MD.1-2

Misconceptions recognised: reading the ruler's end number without the start.
Counting to 10 CCSS-M K.CC.1-2
- Counting objects one by one CCSS-M K.CC.4a
  - The last number says how many CCSS-M K.CC.4b
    - Counting out a given number CCSS-M K.CC.5
      
      Misconceptions recognised: taking the whole set when asked for some.
    - One more, one less CCSS-M K.CC.4c
      - Adding & subtracting within 5 CCSS-M K.OA.1-2, K.OA.5
        
        Breaking apart numbers to 10 CCSS-M K.OA.3-4
        
        Reading +, − and = CCSS-M K.OA.1
- Counting to 20 CCSS-M K.CC.1
  - Counting to 100 CCSS-M K.CC.1-2
  - Counting up to 20 objects CCSS-M K.CC.4-5
    - Teen numbers as ten and more CCSS-M K.NBT.1
      
      Misconceptions recognised: writing teens backwards (31 for thirteen).
    - Which group has more? CCSS-M K.CC.6-7
      
      Misconceptions recognised: judging by how long the number looks.
  - Reading & writing numbers to 20 CCSS-M K.CC.3
Flat or solid CCSS-M K.G.3
Naming shapes CCSS-M K.G.1-4

Misconceptions recognised: only the textbook orientation counts as the shape.
Repeating patterns
Seeing small groups at a glance CCSS-M K.CC.4
Sorting by one attribute CCSS-M K.MD.3

Misconceptions are the rules children reach for that almost work; the names here are the research vocabulary for them. Cardinal Math watches for them as the problem is worked, not just in the answer. The guides under Help for parents walk through the common ones with examples.