My major is closely relevant to my work.

[sania-baharat]

Are these two sentences OK?

I have done a bachelor's degree in power engineering, which is closely relevant to my work. This is one of the highlights of my job.
I have done a bachelor's degree in power engineering. My major is closely relevant to my work, which is one of the highlights of my job.

 

[GoesStation]

All three sentences are grammatically correct. I don't think you mean to say that your work is one of the highlights of your job - which doesn't make sense - but that's what both second sentences mean.

 

[Matthew Wai]

'The highlights of my life' should make more sense.

 

[sania-baharat]

All three sentences are grammatically correct. I don't think you mean to say that your work is one of the highlights of your job - which doesn't make sense - but that's what both second sentences mean.

I want to say that because my work is closely relevant to my major is the reason that I like my job.

 

[Matthew Wai]

My major is closely relevant to my work; that's why I like my job.

 

[GoesStation]

How about highly relevant​?

 

[Matthew Wai]

because my work is closely relevant to my major is the reason that I like my job.

I think it is ungrammatical. I would replace 'is the reason that' with a comma.