Logical / sequential order
Firstly, secondly, thirdly etc
Next, last, finally
In addition
Furthermore
Also
At present / presently

Order of importance
Most / more importantly
Most significantly
Above all
Primarily
It is essential / essentially

Contrast
However
On the other hand
On the contrary
By (in) comparison
In contrast

Result
As a result
As a consequence
Therefore
Thus
Consequently
Hence

Comparison
Similarly
Likewise
Also

Reason
The cause of
The reason for