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

EmphasisAdditionContrastOrder
UndoubtedlyIn addition toIn spite ofSubsequently
ObviouslyFurthermoreOn the other handFirstly
IndeedMoreoverConverselyFirst and foremost
ImportantlyBesidesApart from Last but not least
AbsolutelyLikewiseAlternativelyFinally
Without a doubtSimilarlyWhileSecondly
With this in mindIn the same wayNotwithstandingThirdly
Important to realiseAs well asAlthoughNext
UnquestionableApart from thisRegardlessTo begin with
UndeniableNot only…but alsoNeverthelessLastly
Above all elseAdditionallyDespiteEventually