This video explains an any% "glitchless" hardcore Rogue run by xavier_sb. The run wasn't submitted to the leaderboard. Glitchless is in quotation marks because it's difficult to define what counts as a glitch and what doesn't as many people have different interpretations of it. Always make sure to check the current rules before you start speedrunning if you intend to submit your run(s)!

Regardless of whether some of the tricks/glitches are not allowed, this should give a good overview of most aspects of the run and be a good starting point if you are interested in starting to speedrun Diablo without duping.