Are there any extraneous variables that affect learning a new language?

Question: Are there any extraneous variables that affect learning a new language?
- Keywords:
  challenge,
  languages,
  learn
Asked by anon-342633 to Angela on 28 Nov 2022.
- Angela de Bruin answered on 28 Nov 2022:
  
  There are quite a few! Motivation, how much you can use a language, how/where you learn that language, how similar it is to languages you already speak, they are all very important!

Question: Are there any extraneous variables that affect learning a new language?