Linux 101 stuff. Questions are encouraged, noobs are welcome!

Sometimes adding a blank character helps with formatting. For example on Lemmy, it helps me separate lines of text if I insert a blank character between other lines. Currently, do that by copy-and-pasting the blank character from elsewhere. Here is an example

Is there a way I can do this on Linux easily from the keyboard? I am using KDE Neon and have the compose key enabled so that I can easily type uncommon characters like ‽, ñ, and é easily.