Hello , I personally think the main thing is what you like, or what you are good at, not what is good to learn.
So in short, whichever technology you learn to do very well, as long as you have a certain ability is good to find a job, if you have the ability to general, then find a job is certainly not so easy.
So I personally think the first thing to look for a job is: what are you good at yourself.If you really don't know what you like, then get a piece of paper and deal with it first, combing through:What do people compliment you on the most since you were a kid? What do you do that you can do faster than anyone else in the same amount of time, and even finish better than anyone else?
Take a simple example, when reading, others write a language essay in an hour, you can finish it in 30 minutes and get the same score as others, so writing essays may be an advantage for you.
Or perhaps, since you were a child, your elders said that you were very good at talking, so "good at talking" might be one of your strengths.
You need to summarize all these points and then choose a major that you like according to your own interests, not what is good for employment.
In fact, I have always believed that "interest is the best teacher", if you are interested in a certain thing, then you will work tirelessly to study it, and even do sleep and eat.
But on the other hand, if you are interested in something, you may need to spend a lot of time on it, but you may not achieve the desired result, and you will always get distracted while doing it.
So in short, the question of what you want to specialize in for a good job is actually unanswerable.
Because the main thing is to look at the part that you are good at, combined with your own interests and hobbies to choose. Of course, if your family has a lot of connections in the latter said "background", is engaged in a certain industry, you can also choose the relevant industry, the future they can help you a hand.
For example, most of the elders in your family are teachers, so if you choose to be in the teaching profession, then in the future on the road to employment, they may be able to guide you, so that you have to go a lot less.
So to summarize, I personally feel that "what technology is good to learn in your 30s" has three main bases: first, what are you interested in; second, what are you best at? Third, what kind of contacts you have in your family. Find these three **** the same point of combination, synthesized is the technology you should choose to learn.