I'm new to BASIC overall and decided to pick it up. While looking through a program coded in it so I can learn, I saw that they used a technique of skipping to parts of code they want to run by typing "GOTO {line number}", or just saying "IF {expression} then GOTO {line number}" at least I believe it's a line number. The author put a number at the start of every line that goes up by 10 each line, and sometimes it goes up by hundreds. This is a snippet:
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10 PRINT "Hello. How old are you?"
20 INPUT A
30 IF A < 13 THEN 100
40 PRINT "You're older than 13."
50 END
100 "You're younger than 13.
110 END
Can someone tell me what this method is called (if anything) and how it can be useful?
Thank you :)