You can use final cut pro x or iMovie on Mac OS, or Camtasia Studio or Adobe Premiere Pro or DaVinci Resolve on Windows, or DaVinci Resolve or Blender or Kdenlive or ShotCut on Any Linux distro. But I prefer command line tools. Install mkvtoolsnix or use HomeBrew to install it : brew install --with-qt5 mkvtoolnix. Use mkvinfo to get the audio track IDs that you want. command like this mkvinfo *.
use the dedicated button on keyboard There is a PrtSc button, or Print Screen, or Prt Scr, or similar name. Press this button, and open Paint program and press ctrl+v to paste the screenshot image. capture the active window To take a screenshot of the currently active window, just press Alt + PrtScn then paste the screenshot image in Paint program or Photoshop or any other image editing / creating program.