What would you put effort in this learning-matrix?

Question

Given two dimensions, time and target, forming the following learning-matrix, what would you put (anything related about being a developer) in the following four regions?

                limited time      continuous
with                 1                2
target          

without              3                4
target

for example, below is my trial:
1. certification
2. API / framework
3. language syntax
4. principle / theory

Answer 1

             limited time      continuous

with 2 1 target

without 4 3 target