How can I use HxD Hex Editor?

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No wonder such a course would take only 10 minutes.

understand the numbers

Quite simply: an evaluation system with the base 16 (i.e.: 16 digits: 0.1,2,3,4,5,6,7,8,9,A,B,C,D,E,F instead of the 10 digits at decimal).

Decimal (from right to left): One, ten, hundreds, …

Hexadecimal (from right to left): One, sixteen, fifty-two, …

Since the range 0 to 255 can be accurately covered with two hexadecimal digits, which is “probably” also the value range of a byte, the data are shown in most witch editors as groups of two digits each.

I want to know how to deal with the HxD tool

Simple:

• You select a processing mode (“overwriting” = When tapping, existing values are overwritten and added only at the end; ” Insert” = When tapping, values are inserted at the current cursor position, basically as in a normal text editor).
• You navigate to the place where you want to edit something (either scroll through, jump to the outset, or after text or text or Search Hex-String).
• You process your data and save it.
• Ready.