What are these cracks? I’ve uploaded a wide and a close up. This is in a garage, the wall is the exterior wall. It’s a slab on grade, no basement, no crawl space.
Are these cracks bad?
Thanks for the help!
Was this a painted floor?
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In the second photo, it looks like a rectangle shaped outline. Maybe some chemicals were stored in that area and leaked.
Agree with Junior
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Thank you sir!
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Jr nailed it. With proper prepping and application of a high quality (not from a big box store) sealer, it will be fine unless spalling has already started.
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You’re welcome. 
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Nice to see you back Lukasz!..you have much experience to share with the members. 
It was not, just concrete.