To list points: in the first place, firstly, to begin with, lastly, secondly
To add more points: also, moreover, in addition, furthermore
To introduce opposing viewpoints: on the other hand, however, apart from this, alternatively, in contrast, while
To introduce examples/reasons: for example, therefore, for instance, in particular, because, since, such as
To conclude: to sum up, all things considered, taking everything into account
To begin with – In the first place
What is more – Furthermore
for example – for instance
On the other hand – Alternatively
Also – Moreover
All in all – All things considered