All 3 Uses

however
in
Year of Wonders
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The nettle beer, however, was new to me.†
Chpt 3 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
However little you know, it's more than I do, who never has labored myself nor even birthed any livestock.
Chpt 7 *

however = regardless of how
And pray retain this rule: never do that thing upon which you dare not first ask a blessing of God, upon the success thereof...Sir, pardon the rude style of this paper, and if my head be discomposed y ou cannot wonder at me; however, be pleased to believe that I am, Dear Sir, your most obliged, most affectionate, and grateful servant ....†
Chpt 15

Definitions:

(1) (however as in: However, complications may...)
though (or another expression that connects contrasting ideas)

Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 exists, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrast and but.
(2) (however as in: However much she tried...)
to whatever degree (regardless of how much; or whatever unspecified amount)
(3) (however as in: However you do it, get it done!)
in whatever way
(4) (meaning too rare to warrant focus)
Much more rarely (and arguably incorrectly), however can be used to intensify the word how, as when one says "However did you find her?" Grammarians would suggest using two words for that usage: "How ever did you find her?"