There are two types of fatty acids that we should be concerned about. One type of fatty acid is omega-6. Omega-6 fatty acids are commonly found in red meats, eggs, vegetable, and others. The other type of fatty acid is omega-3. One of the cheapest and plentiful sources of omega-3 fatty acids is fish oil. Typically, most Americans consume much more omega-6 fatty acids than omega-3 fatty acids. Omega-3 fatty acids reduce inflammation and omega-6 fatty acids promote inflammation. Therefore, a diet that has a proper balance of omega-3 and omega-6 fatty acids, preferably 1:1, produces the following benefits:
“…healthier blood vessels, a lower lipid count and a reduced risk for plaque buildup. Fish oil can also decrease the risk of diabetes and several forms of cancer, including breast cancer.” 
In addition, “Supplementing with fish oil may support a healthy blood cholesterol profile already within a normal range. Adding 3-6 grams of fish oil a day can help promote healthy ratios of HDL to LDL, as well as healthy levels of triacylglycerol concentrations in the body when they are already in healthy range…Studies have looked at the implications of long-chain polyunsaturated fatty acid intakes on the bone density and calcium balance in menopausal women, and have found that those who do take in higher levels of fatty acids may help support healthy bones…Fish oil consumption helps support the levels of serotonin in the body, which is often termed the “feel-good” hormone.” 
A recommended dosage of fish oil is 1g a day, which is equivalent to one pill a day. However, some people have experienced a decrease in soreness when taking 6g of fish oil spread out throughout the day.
In conclusion fish oil has a lot of benefits for overall health. Fish oil is a must in your supplements lineup. Considering that it is so plentiful and fairly cheap, I highly recommend you start taking fish oil.