How can I translate in inglish

I know a little aabout something

actually depends on what's the object of 了解
In different circumstance, Can be translate to 1.Being more familiar with ......2. know more about ......3. have better knowledge of ......4. have a better understanding with .....
5. know something /someplace better......

I believe 'moderately familiar with' would suffice.

I'm not a teacher, but I had a class with my own instructor, where she taught me to think of 比较 in terms of "relatively".
Given that in mind, I would think this phrase would translate to "relatively know something more" about something.

I think “know well” better

"比较了解" can be translated to "relatively familiar" or "fairly knowledgeable" in English.

The phrase 比较了解 can be translated as "fairly familiar", "have a general understanding." or "know well".

The exact meaning is still translated according to the context, you may share the full sentence.