oh
If the reason you are ignoring them is because you don't know how to use them, then yes, I would say it is unwise to do it.
They are symbols that dictate dynamics in the music (how loud you play), if they are right or not, it depends on the edition (they are sometimes written by the editor and not by the composer himself) and I think it is perfectly acceptable to change them according to the way you feel the music should be played.
But first play them as they are written, and then change them because you want to change them and not because you don't know what they mean.
They go from
pppp - as softly as possible
ppp
pp - pianissimo (very soft)
p - piano (softly)
mp - mezzo piano (not as soft)
mf - mezzo forte
f - forte (loud)
ff - fortissimo (very loud)
fff
ffff - as loud as possible
I hope I got all that right, feel free to correct me if not
There are also many other signs that appear in sheets
Their meaning is sometimes even open for discussion since music notation keeps changing throughout history
But if they are there, the composer placed them there for a reason and you should learn their meaning even if you later decide not to obey them
Hope that wasn't too confusing and that some of the teachers in this forum will help me if I'm wrong in any way
Feel free to ask if you find any unknown symbols
[]
PS -
https://en.wikipedia.org/wiki/Dynamics_(music) just found this on wiki, if I find a pppppp in my sheetmusic, I'll pound my head into the wall...