Welcome ItsKYRO! In this day and age it is very overwhelming to pick the right folding knife, as we have so many to choose from. But luckily we are able to have a great selection of them with good steels, craftsmanship, handles on them for a good price!
Most of the guys pointed you the right way already. For knife steels, charts are a good way to go for a basic understanding of the differences in the performance of steels. The main characteristics to look for are toughness, rust resistance/corrosion, ease of sharpening, edge retention. But like Blues said, don't get too fixed on decision making with just the steel used. I totally agree that it's the whole '.45acp vs 9mm vs etc..' thing. They are all going to work regardless.
For handles, most companies use:
G10-a plastic like composite material that is very durable, provides a good grip and isn't all that expensive for a company to use so it helps keep the price down.
FRN(fiberglass reinforced nylon) or grivory- which are close to the same. Pretty much just a plastic. Most people say it feels cheap like plastic on a toy, and does, but is still durable and very forgiving. This is even cheaper then g10.
Micarta- fabric layered with an epoxy to make a strong material. There's paper, linen, canvas micarta, which is just that. The material itself will even feel like canvas or linen if sanded down. This has always been my favorite handle material, but it isnt found often in folding knives.
Then comes your stainless steel(ss), carbon fiber(cf), titanium(ti), and aluminum handles which im sure you already know about.
SS-probably the strongest, but heavy.
CF-the lightest, but more delicate then most. Still strong though, but this and titanium have the higher price tags on them.
Ti-one of the strongest per weight ratio's of any metel/alloy.
Aluminium- very light weight and reasonably strong.
Hope that helped a little and wasnt too confusing. Dont get too caught up in handle materials either. It comes down to what you like to use, handle and play around with, and how it makes you feel. Having a knife you like, is like anything else (a nice tool, automobile, phone, etc..). It just makes life a little nicer/comfortable
