Here's the wiki on the Bird's Opening (normally reached, immediately, via 1.f4):
https://en.wikipedia.org/wiki/Bird%2...lank%20opening.
This opening is generally suitable for attacking players who are willing to go a bit offbeat. Also, if you like the look of the Dutch Defence, but you may or may not believe White should get a clear edge against that, then the Bird's might be an attractive choice when playing with White.
An issue for Bird's players may be the From Gambit (1.f4 e5). Some players won't like having to carefully defend with White after 2.fxe5, especially if they haven't studied the line in a while - even though many sources prefer White these days. One solution is to transpose to the King's Gambit, with 2.e4, moreso if you already play that opening (after 1.e4 e5). Note too that many players don't play 1.e4 e5 as Black these days, and aren't willing to prepare for the KG, so it seems Bird's players might seldom face the From in practice nowadays.
Another way to avoid the From, if it still seems a bother, is to hope to transpose to some variation of the Bird's after a different first move as White that you build a White repertoire [choice] around. Namely 1.b3, 1.c3, 1.d3, 1.e3 or 1.g3. After 1.g3 d5 I wouldn't recommend an immediate 2.f4 though, as the berserk attack with 2...h5 looks too dangerous in that instance. Note in case of 1.c3 e5 2.d4 exd4 3.cxd4 d5 Black has a fairly equal version of a QGD Exchange, as he can aim for ...c6 (to permit ...Qb6 in reply to Qb3) and then ...Bf5 before White can deploy both of his bishops in ideal fashion. Emmanuel Lasker once played 3.Qxd4!? in a simul instead, virtually reaching a Scandinavian Defence a tempo up, but objectively Black ought to be comfortable here too.
Here's a link to a thread about the King's Gambit:
https://www.chesscanada.info/forum/s...ing%27s+Gambit