What You All Think About the Limits of Memory?

[LevelUP]

If we are talking about computer technology, for example, there is an almost infinite amount of things you can learn.

• Lots of programming languages to choose from
  
• Lots of frameworks to choose from
  
• Gaming development
  
• Mobile app development
  
• Cloud software development (SAS)
  
• Front-end/Back-end or go Full Stack Development
  
• AI
  
• Hardware programming
  
• IT with all kinds of certs you can do from cybersecurity to networking, etc. 
  

So at some point, you would have to pick and choose what you want to learn to land a job.

I have seen some job listings that ask you to be an expert at designing things and also be an expert at a bunch of technical skills at the same time.

Basically, it would be hard to be a history teacher, then moonlight as a cybersecurity expert, then at the same time, be in charge of supply chain management at a major company.

So the questions are, what are the limits you can learn to get the job you want? What are the limits to learning new things while on the job?