Conjunctions

for
and
nor
but
or
yet
so

Clause 1, and clause2.  Comma before the conjunction.

And I like this job very much. Incorrect
I think this is a good job for me, and I like this job very much.  Correct

If you want to start with a connecting word use the bigger words:
Therefore,
However,
Also,
In contrast,
Besides,
Despite this/that,
Because A, B.  Because the books were late, we had to study from copies.