So micro-evolution is basically textbook evolution. This is not going to be in depth but basically a trait is selected for and this trait is passed down to offspring. This is organisms adapting to their environment. Of course you can add on to this but the basic idea is descent with modification. As a result, a beetle, might get smaller when food is scarce etc, or a bird might grow lager wings etc etc. There are obviously extreme examples but the important point is that they remained the same "kind" as referenced in the bible. So a canine remains a canine, a fish remains a fish. Yes there are different kinds of fish, yes there are different kinds of plants and vegetation, but they remain in there kind. If you read the bible it says that all the creatures of the sea were created on the same day. So yes there are many different kinds of sea creatures within which variation occurs, but they are categorized as sea creatures, that is their environment. Likewise God created birds of the air, animals, creeping things (insects etc.), and plant yielding seeds. God also gave his creation wisdom.
This is not the same as macro evolution, which essentially says that Macroevolution is basically a belief that descent with modification can extend to different categories with which God created, so sea dwelling to land dwelling to flying to insects all come from a common origin. This is not the case, there is also no evidence for this, you can say the fossil record, but that is simply an interpretation, macroevolution has never been tested or observed, and it can never be tested or observed so it is taken by faith. What it boils down to is that from a solution of organic chemicals, all of variation and complexity on earth arises. That is what it boils down to. Interestingly if you listen to the first talk by Gerd Muller on the link I gave he says molecules aren't life, but God says "....everything that has the breath of life, I have given every green plant for food.” And it was so. 31 And God saw everything that he had made, and behold, it was very good. And there was evening and there was morning, a sixth day."