What does it mean by Language Crash Course for any language?

1. Is it hard?

2. What is the minimum learning load?

3. If I know one language how can I write in another one quickly?

4. What are those minimum topics to become productive for most general tasks?

5. General tasks are those which you most often in a language

6. What is the minimum set so I get the rhythm of the language

8. What is the theory behind those topics for a non programmer and a seasoned programmer

9. What do I need to write a non trivial useful (subjective) program?

10. Can I get a single program in a single file that demonstrates ALL topics above so I can use it as a template?

1. Theory

2. Tools (installation, editor)

3. Single file comprehensive crash course program

1. Theory

2. Tools (installation, editor)

3. Single file comprehensive crash course program

1. Python

2. Julia

3. Powershell

4. Java

5. C#

6. Rust

7. Javascript

etc....

1. Theory

2. Tools (installation, editor)

3. Single file comprehensive crash course program

4. A set of simple projects