• adding multiple clips to timeline at once: just select all and drag in. make sure not to select other file types e.g. timelines, it won't work
• exporting: rocket page -> add file name and location -> mp4 format H.265 -> Add to Render Queue -> (In Render Queue:) Render All
• removing pauses:
• automatic subtitles:
• menu: edit -> delete gaps
• With the "del" key you affect the whole timeline while the "backspace" key only interests the selected elements.
  • delete only video: backspace

(obs: add source "display capture" and maybe "audio output capture", then "start recording")

performance:

• right-click clip: "render in place"
• menu "Playback"
  • render cache: smart
  • timeline playback resolution: quarter