Transitional words and phrases are important as they make writings less choppy. Here are some examples:

Emphasis	Addition	Contrast	Order
Undoubtedly	In addition to	In spite of	Subsequently
Obviously	Furthermore	On the other hand	Firstly
Indeed	Moreover	Conversely	First and foremost
Importantly	Besides	Apart from	Last but not least
Absolutely	Likewise	Alternatively	Finally
Without a doubt	Similarly	While	Secondly
With this in mind	In the same way	Notwithstanding	Thirdly
Important to realise	As well as	Although	Next
Unquestionable	Apart from this	Regardless	To begin with
Undeniable	Not only…but also	Nevertheless	Lastly
Above all else	Additionally	Despite	Eventually