The adverb surtout is actually two words combined: sur (over, above) and tout (all). Once you know that, its meaning is self-explanatory:
Et surtout n'oubliez rien.
And above all, don't forget anything.
Caption 9, Bande-annonce - La Belle et la Bête
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There are a couple different ways of saying "above all" in English, all of which are encompassed by surtout. There's "most of all":
Mais surtout c'est toi
But most of all, it's you
Caption 30, Aldebert - La vie c'est quoi ?
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"Especially":
J'ai du mal à mentir, surtout quand c'est pas vrai
I find it hard to lie, especially when it's not true
Caption 29, Babylon Circus - J'aurais bien voulu
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And "particularly" or "in particular":
J'aime surtout la cuisine japonais.
I particularly like Japanese cuisine. / I like Japanese cuisine in particular.
Note, though, that "especially," "particularly," and "in particular" have more direct equivalents in French as well:
C'est le sujet qui nous intéresse tous spécialement aujourd'hui.
It's the subject that's especially of interest to all of us today.
Caption 62, Uderzo et Goscinny - 1968
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Mais quand on est sensible à la peinture,
But for one who appreciates painting,
ici, la lumière est particulièrement belle.
the light here is particularly beautiful.
Caption 8, Arles - Un Petit Tour d'Arles
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Les plages de la côte atlantique et en particulier
The beaches on the Atlantic coast and in particular
de la côte basque sont des plages très étendues.
on the Basque coast are very vast beaches.
Caption 31, Voyage en France - Saint-Jean-de-Luz
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Surtout can also mean "mainly" or "mostly," which isn't quite the same as "above all":
En fait c'est ça surtout.
In fact that's it, mostly.
Caption 37, Alsace 20 - La chronique Mode de Caroline: mode éthique
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Aujourd'hui j'ai surtout travaillé au bureau.
Today I mainly worked in the office.
In informal speech, surtout is also the equivalent of "whatever you do" or "be sure to":
Surtout, ne rate pas le prochain épisode de "Extra"!
Whatever you do, don't miss the next episode of "Extra"!
Caption 10, Extr@ - Ep. 5 - Une étoile est née
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Surtout, regardez les vidéos les plus récentes sur Yabla French!
Be sure to check out the most recent Yabla French videos!