First, look at the log of the error that is occurring. If you encounter a common error (eg template missing or undefind method for nil Nil Class), make your own hypothesis and find the cause.
Search for errors you haven't seen often, as needed.
In the case of development environment, the error statement gives a lot of hints. Read and understand the situation, search if you do not understand the meaning
① Correspondence based on past error experience ② Search and if there are similar cases, take the same action ③ Once again, think about what the current situation would be ideal and make full use of debugging. Check how far is ideal Is it?
If you have to do ③ firmly to improve the search accuracy of ② There are many!
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