The bits in the middle with a cone shaped tip formed just by grinding the ends of the shaft are general purpose bits. Suitable for materials like wood plastic and metals (though harder metals may be a problem for cheap drill bits).

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The bits on the right with a blunt insert at the tip which is wider than the shaft are masonary bits. As the name suggests they are for use in masonary (brick, stone, concrete, plaster etc).

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The middle are general purpose bits. They can do wood, drywall, plastics like PVC, and possibly metal. Their gold color might indicate that they are titanium-coated bits; at least that's what Milwaukee does. Black general purpose bits are usually black oxide. Different metals indicate different durability.

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There aren't any in your set, but you also get "multipurpose" bits, which are consturcted in a similar way to masonary bits but the insert is sharper, these are handy when you want to drill holes through multiple materials.

"It means" at one level, what surface finish was used, if any. Polished steel, black oxide, or titanium nitride (or cheap imitation gold-colored stuff pretending to be TiN)

However, by inspection (looking at the business ends of the bits) I can see that the "silver" ones are wood and/or plastic bits, the "black" are masonry bits, and the "gold" are metal/general purpose bits. For this set, only. All those types of bits can come in any of these colors, but in this set, that's what you've got.

The gold colour originally indicated a hard Titanium Nitride coating, which was supposed to reduce friction and improve tool life, but whether your bits actually have a Titanium Nitride coating or just some cheap imitation is hard to tell.

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The ones on the left are called brad-point bits and are great for going through dimensional lumber. Depending on the region they could be colloquially called auger bits.

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Those pointy wide ones at the bottom are paddle or spade bits and are used for boring large holes in lumber. These usually max out at 1-1/2".

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