You need to be more specific.
Depends on the thickness of the metal.
Sheet metal less than 18 gage steel - To make straight cuts, you would use a pair of "King Snips'. These are the large ones that look like giant scissors. To make smaller or round cuts, you would use "Aviator Snips". Aviator snips come in three types. Right, for making left turn cuts, Left for making right turn cuts, and Center for making general turns in both directions but can't turn as tight as Left or Right. Just remember, turn left, red handle. Turn right, green handle. Utility, yellow general straight, left, and right. Be very careful because sheet metal can be like cutting a razor blade and it can severely cut you if not careful. There are other specialty tools and cutters such as nibblers, power snips, cutting wheels, plasma cutters, etc. But some of these are very expensive.
For metals thicker than 16 gage, you will need specialty tools to cut these metals.
Electric Head Metal
Cutting Shear 18 14 Gauge Steel Cutter Snip Power Tool HD, BOLTON TOOLS Slow Speed 10 Cold Cut Saw w Swivel Base Coldsaw Metal
Cutting, Makita BCS550 18V Cordless LXT 5 3 8 Lithium Ion Metal
Cutting Saw Bare Tool, AIR BODY SAW AUTO BODY ATV METAL
CUTTING WORK SHOP TOOL, BOLTON TOOLS 7 INCH x 12 INCH METAL
CUTTING BANDSAW Band Saw with Wheels, 20PC 1 4 CARBIDE TIP TIPPED CUTTER TOOL BIT
CUTTING SET FOR METAL LATHE TOOLING, PRO PNEUMATIC AIR NIBBLER SHEET METAL
CUTTING AIR TOOLS, 25x 3 SHEETMETAL
CUTTING CUT OFF WHEELS DISCS AIR TOOL DIE GRINDER METAL STEEL, New Air Shear For Sheet Metal
Cutting Auto Body Tool, 20PC 1 2 CARBIDE TIP TIPPED CUTTER TOOL BIT
CUTTING SET FOR METAL LATHE TOOLING, PORTABLE POWER HAND HELD METAL STEEL
CUTTING ELECTRIC BANDSAW HACK TOOL BAND SAW, Makita JS3200 Metal Mild Gauge Steel
Cutting Shear Tool Electric, 20PC 3 8 CARBIDE TIP TIPPED CUTTER TOOL BIT
CUTTING SET FOR METAL LATHE TOOLING, 14 INCH ELECTRIC METAL
CUTTING ABRASIVE STEEL POWER CUT OFF STEEL CHOP SAW TOOL, 1935 Ad Mo Max Steels Materials Metal
Cutting Tools ORIGINAL ADVERTISING, Warner Swasey lathe
cutting machining metal cnc mill press weld tap tool, 1920 Ad Simonds Saw Steel Tools
Cutting Metal Fitchburg Massachusetts Blade, TUBE
CUTTING JIG METAL WORKERS FORMING TOOL CUTS ROD, Irwin 372606P5 Industrial Tool 5 Count 6 in 6 TPI Metal and Wood
Cutting, ELECTRIC POWERED SHEET METAL STEEL
CUTTING POWER SHEAR TOOL SCISSORS CUTTER, 2682 20 Milwaukee M18 5 3 8 Metal
Cutting Saw TOOL ONLY, 50x 3
CUTTING CUT OFF WHEELS DISC AIR TOOL DIE GRINDER METAL STEEL THIN 75mm, 10 New Expert Tools Cut Off Wheels 14 x 1 8x 20mm Metal
Cutting 59226, HD AIR METAL
CUTTING SHEAR TOOL AIR TOOL COMPRESSOR, DEWALT 80 Piece Professional Drilling Driving Bit Tool
Cutting Metal Wood Set, BOX 100 3
CUTTING CUT OFF WHEELS DISCS AIR TOOL DIE GRINDER METAL STEEL THIN, AIR NIBBLER SHEET METAL CUTTER HD
CUTTING TOOL NEW, StrapMaster METAL BANDING CUTTERS THIN JAWS hand held
cutting cutter tool, 16 Gauge Air Nibbler Metal Cutter Shear
Cutting 1 16 Thick Air Tools Auto Body, 16 GAUGE AIR NIBBLER SHEET METAL
CUTTING TOOL AUTOBODY,
