No need to apologize for asking. When the answer for every question is "do a search" then the site is doomed. There is however lots of information posted in other threads.
Basically there is merit to filing or grinding however either can be screwed up by those who have no time for details or paying attention to what is in front of them or learning from their mistakes.. If so inclined I suggest buying 10-20 chains and taking them to a saw shop for grinding. For a person who desires to learn either method will sharpen chains however filing will both achieve a keener edge and accomplish it with less metal removed. Having cut along side of people who confuse their saws with a Ditchwitch trencher I also understand the need for some to grind . We own a grinder but the only time it gets used is when we hit an object imbedded in the wood or hit a rock. I will stress that you need a means of mounting the saw if your going to learn how to hand file correctly and quickly. Having watched people try to file a saw while rocking back and forth on the ground or on the tailgate of a pick up truck I understand why some would say hand filing is for the birds. So, if your going to hand file you need a vise be it a big bench vise, a home made one just to hold saws, or a stump vise used out in the woods. A person absolutely cannot properly file a chain otherwise and it really makes hand filing the miserable chore that some describe. Beyond that every chain Mfg has lots of good info on hand filing. Once you know what to look for and how to do it on a properly secured saw all you need is a file and a handle. The various "crutches" just get in the way of an experienced filer but they do beat the pants off of indiscriminately filing away at the chain. I have watched many you tube flicks on the subject and be damn careful about what you place in your memory banks if you chose to learn there.
As for equipment we purchase Stihl files by the box lot. 5/32/ 3/16 and 13/64 (which are also used where 7/32 is recommended) a few handles and a big Sarrett bench vise in the shop. Seldom do we file in the field, I take an extra saw or chain instead. We adjust the depth gages when the teeth are about 1/3 gone and again when 2/3 gone and don't see a need for doing it more often. This is one place we always use a jig, usually the Oregon made ones.