Capture, in Sentry MBA, is parsing a value(s) from the source code.
Parsing: analyze (a string or text) into logical syntactic components, typically to test conformability to a logical grammar
What that means, is basically, you can select something between the source by selecting a left and right string.
Field Name: What this is, you can name it anything, so you know what the value you captured, or parsed is.
How To Capture/Parse Manually
For instance, take a look at this picture
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