When to appropriately use soi and soi-même? This lesson didn't address this issue.

Hi Cathy,

"soi-même" is "oneself" or "yourself" in English. For example:

"Pour l’apprendre aux autres il faut le savoir soi-même." -- To teach it to others one must knkow it oneself (or: you must know it yourself).

Or, in another example:

 

Il vaut mieux le faire soi-même. --It’s better to do it yourself.Does that help? -- Chris (not a native speaker).

 

Merci bien!  

Check the later questions. Aurélie and Laura answered this question there. 

-- Chris.