ᐅ Repairing and coating a trowel-finished garage slab foundation

Hello everyone,

We have a power-troweled concrete floor in our garage.
In a few spots, the concrete has chipped off in various sizes, probably due to objects that fell on the floor during construction, such as a hammer or similar.
The holes range from 0.5 cm to 3.5 cm (0.2 to 1.4 inches) in diameter.
My question to you: how can I repair these areas myself so that the floor is as uniformly smooth as the rest? Do you possibly have product recommendations?
I am planning to "paint" or coat the slab to protect it from influences like de-icing salt or similar and also to give it a more uniform appearance. Currently, the concrete looks “spotty,” which seems to be normal.
Here I would like to ask whether a coating is recommended or if it is unnecessary because of the power troweling. What kind of coating would you recommend for a DIY project?

Thanks for your answers.
Good luck, Ippebson