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My suggestion is to have some basic understanding of these topics firstThen go and have a chat with the instructors in the training centres, you can easily tell which one is better if you know some basic points.
这三个我都不知道有培训中心在教。。。前面两个网上资料多得足以自学。后面一个如果你没有在工作中用到，学也没有什么用。
古竹
My suggestion is to have some basic understanding of these topics first
Then go and have a chat with the instructors in the training centres, you can easily tell which one is better if you know some basic points.