- of course ==> of course,
- core for ==> core of something
- is there and exists ==> repetitive
- learnt: ==> US English learned, UK and South African English: learnt, since there are more US readers than UK readers I would go with US English
- learnt already --> word order: already learned
- quite a bit : too fluffy, too relative ==> removed
- This will repeat some ==> sentence structure can be improved, restructured