Among them, encyclopedia is more systematic.

For entry-level, the biggest advantage is that it is economical and convenient, and the accuracy of definition and labeling is high. The specific trend analysis is for reference only.

Websites and forums are easy to find, and the following one is more lively.

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It is not easy to learn theory, and it is even more difficult to apply it correctly. Finding a suitable simulation software will get twice the result with half the effort.