在美國工作高薪是由marketable skill所帶來的

Yes, totally agree with your articla.

You do not need to be a manager to get a stable job.

In USA, the real job security come from your skill.

You rely on a hard skill to find a job.

Now days, every family have a PC or a laptop.

Why don't use that PC or laptop to be a tool to help you gain a hard skill and find a good job?

Yes, it is doable, many people did that, you can do the same too!