音楽フェスが売り切れる前に登録したほうがいいよ

Meaning
you should register for the music festival before it sells out

Vocab used in this sentence

音楽
music, musical, musically
フェス
fes, festival, fess
が
is, there, but, ga, will, however
売る
sell, to sell, vend, betray
切れる
expire, sharp, break, burst, snap, shrewd
前
for, before, front, ago, in front, pre, previous, miss, since, earlier, former, above, presence, previously, portion, preceding
に
in, to, on, at, into, upon
登録
register, registration, subscribe, enroll, record, entry, enrollment
し
and, shi, four, death
た
the, was, ta, da, other
ほう
better, ha, way, method, means, manner
が
is, there, but, ga, will, however
いい
good, nice, ok, great, okay, fine
よ
the, yo, ll

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