To list ideas in order of importance:
first,
second,
f________

for example, ...
for instance, ...
that is to say, ...

on the one side - on the other side
on the one hand - on the other hand

To add an additional idea:
in addition,
furthermore,
m_____________

in short, ...
in conclusion, ...
at last, ...
in a nutshell, ...
in summary, ...

The flight was delayed because there was a storm.
The flight was delayed because the storm.
The flight was delayed because of the storm.

but
h______________________

as a consequence, ...
for this reason, ...
consequently, ...
as a result, ...

despite of global warming
in spite of global warming
despite global warming