[Crex]

They make different style/shape/cut files for certain reasons. It's best to read up a little on application of the diff types. Learn about using a File Card and use it regular. The only place I've seen really good info on selection and use of diff files was an old issue of Lapidary Journal. I'm sure there are other sources, just have to do a little googling. There also might be a "Sticky" somewhere here on KNF so you might try the "Search" feature.
I recommend never mixing files I use for wood with files used for metal, I also never mix soft metal files - brass, nickel, copper, etc. with files I use for steel. Keep you files separated so they don't bang into each other and mark use with different color paints on tangs. Handles make big diff in how well you can use a file. I save old golf balls and drill a small hole 3/4's way through then tap on to the tang.
Note: Quality files will cost more than junk files....just like any tool.