How to download, install, and use DOSBox to play DOS games, including Doom (1993) (shown here)

Doom (1993) has a shareware version still available online. The shareware version includes the first of four episodes, Knee-Deep in the Dead. To gain access to the other three, you will have to purchase the full version of Doom online. Steam has a really awesome package deal for a lot of the old Doom games.

Here is a walkthrough I made for Knee-Deep in the Dead:
https://youtube.com/playlist?list=PLtVYbszwxQ3CN9hN7z7U_DHbAMPmys9gq&feature=shared

DOSBox:
https://www.dosbox.com/

DOS Games Archive:
https://www.dosgamesarchive.com/license/shareware

Doom (shareware version):
https://www.dosgamesarchive.com/download/doom

7-zip (convenient tool, but not necessary):
https://www.7-zip.org/