Used Aegisub for the first time. It is a GUI for creating subtitles:
http://www.aegisub.org/

Once created, subtitles can be embedded in videos, using VLC , if necessary. TJ Free has some tutorials on YouTube:
https://www.youtube.com/watch?v=4gXF6Y-v6BE&list=PLqazFFzUAPc7BgGTaDAvvsGEoLolq09YP