It is so interesting to witness various people figuring out correct answers to the most complex of puzzles asked. I don't know how to cultivate such technique of solving puzzle. But I want to know the techniques and cultivate puzzle solving skills. Is it acceptable on main site to ask such questions?
Yes, it is absolutely acceptable to ask such questions.
Originally, PSE's main focus was supposed to be questions about puzzles. How do I solve this kind of puzzle? How do I create this kind of puzzle and make it just challenging enough? Who was the first person to make this kind of puzzle? What sort of puzzle might be appropriate for a group of 4-6 very bright 9-year-olds? Etc.
When PSE started having a lot of actual puzzles as questions, there was a good deal of soul-searching about whether that was appropriate -- exactly the opposite of your question here!
So, indeed, you are very welcome to ask questions about puzzle-solving techniques. (But ... Introspection is hard, and you shouldn't be too disappointed if the answers are less helpful than you're hoping for. In some cases the best answer someone can give to "how do you solve these things?" might be "well, I'm really clever and I know a lot" :-).)