Essentially

[Sarah]

When used at the beginning of a sentence, this word is a variety of the 'filler' word [basically]. Another direct replacement for essentially is [technically]. Other filler words include [like], [just], [and stuff] and [y'know], but they tend to be in the middle of or at the end of a spoken sentence. Filler words are rarely used in writing and are part of acquired speech.

[Magaret]

relating to the most important characteristics or ideas of something:

[Jessica]

Used to emphasize the basic, fundamental, or intrinsic nature of a person, thing, or situation.