Hello, Krill. As a native speaker, I do not sense any difference among the three expressions: a little; a bit; a little bit. (a bit = a small amount of something) These are all correct (though 1 and 2 are more common): 1. I understand English a little. 2. I understand English a bit. 3. I understand English a little bit. However, please notice the construction of these sentences: 1. I understand a little English. 2. I understand a bit of English. 3. I understand a little bit of English.

I agree with Michele, but note that "bit" is a colloquial word.

"I understand English a little / a bit" - are both OK and mean the same thing. When using "a little bit", it sounds better to use it as the object of the phrase e.g. "I understand a little bit of English" In practice, all three have similar meanings. However, you could say "a little bit" for emphasis e.g. "Do you know English?" "Yes, a bit" "So can you have a conversation then?" "No, I actually only know a little bit of English"

Thank you again!

These are all correct: I understand English a little. / I understand English a bit. / I understand English a little bit. / I understand English some. / I understand some English. / I understand a little English. / I understand a little bit of English. / I understand a bit of English.