|I'm afraid that your question is still not very clear to me, but I'm going to assume that you are asking whether learning HTML will help you get a job in the software development field.|
The answer, essentially, is "no". HTML is an essential language to learn if you want to produce web pages, but is of little use in general software development. So if you want to get into web design then you must learn HTML. But it is such a simple language that that knowledge won't give you much of an edge over other people - anyone could learn HTML in a few days.
If you are interested in general software development then you need to learn a general purpose programming language, such as C, C++, or Java, which is a somewhat more demanding process. For some specific applications you may need to learn another language - e.g. Objective-C (or Swift) if you want to develop apps for iOS or OS X.
But learning a programming language is just part of it. More important is to learn the various algorithms and data structures that are used in software development. For example, if you wanted to sort a collection of numbers according to their size, do you know the most efficient way to do so? And what is the best way of storing those numbers in the first place - a set of variables, an array, a linked list? This is the sort of skill that is really important. Only when you master that will you start to be productive in software development.