Recommended site for errors that you often see

I am a beginner in programming. Errors are common. There are many things to look for in the error. If you can get a rough idea of what the error is trying to convey, I think it is a step toward a solution. Therefore, I will post a site that conveys the standard error in an easy-to-understand manner.

First of all

500 error

This is called an internal error. The cause is a bad location of the file, or a simple programming mistake. Here is a site that tells us various causes! https://www.sejuku.net/blog/77760

• Although it is written as PHP 500 error, it is okay because it is an error common to all languages!

404 error

This is an error that often occurs when the requested page does not exist for some reason (site is deleted, URL is mistyped, etc.). Click here for a site that gives an example of why it doesn't exist! https://seolaboratory.jp/92739/

400 error

This is an error that occurs when the web browser is forcibly requesting the server to not understand. A little annoying image. Click here to get an image of this error! https://wa3.i-3-i.info/word1490.html This site is really for beginners, isn't it?

The most frequently seen error collection

①　java.lang.NullPointerException ②　java.lang.ArrayIndexOutOfBoundsException ③　java.lang.NumberFormatException ④　java.lang.ClassCastException ⑤　java.lang.ArithmeticException ⑥　java.lang.NoClassDefFoundError ⑦　java.lang.OutOfMemoryError

These guys are all at once on this site! !! https://eng-entrance.com/java-basic-error This site has been taken care of many times because the outline is explained in an easy-to-understand manner. You should be able to find a clue to the solution.

After all, what is important for error resolution?

That is, after all, ** reading the error statement **, isn't it? Every site says it all together. Everyone knows it, but I'm afraid to read it. However, the place to read is unexpectedly one or two lines, so let's read it with courage including me.