In this video I somewhat show you how easy it is to sharpen your blade given the right tools...
This Wen grinder can be purchased at Home Depot for less than $80.
***I'm not affiliated with any product I recommend in this post. I am recommending them because I think highly of them and think the makers of these tools deserve support and recognition.
I know not everyone wants to pay $80 for a grinder. If you don't have room in your budget for this grinder, I also highly recommend this product, also from Home Depot.
They are about 7 or 8 dollars, hook right up to your drill (chuck, not impact), and sharpen the blade up pretty well. They also come with a static balancer. They unfortunately will not do what the grinder can accomplish for your mower's blades, but if you do it frequently and avoid rocks and other hazardous objects, that will help.
When sharpening your mower blades with any tool, you should try to keep the blade angle close to the same, whether it be with a file, or any other tool or machine.
A few good reasons to keep our lawn mower blades sharp include:
If you use your mower regularly, you need to maintain (or replace) your machine and its components. The blades are included in this maintenance, and are actually one of the most important parts to an efficiently running machine.
Keeping them sharp or at least in good condition will improve your lawn's look as well as its overall health.
Below you can see the drill attachment for the link above. It's about $8.