how can i repair bad face orientations?

[Csüllög György]

https://imgur.com/a/hjbAJOM
somewhere during the process i managed to ruin most of my buttons. any tip to repair it after so late?

[Dwayne Savage]

Select all the red and press shift+N to recalculate normals outside. 

[Martin Bergwerf]

Or, just Select everything and then re-calculate Normals. So that is: A, SHIFT+N.

[Csüllög György]

YEHEEEEEEEEEEEEEEEEEEES Thank you 🙂 it did repaired it . 

[Csüllög György]

https://imgur.com/a/r6NzBEG

just wanted to show that . its keeps nonstop happening . like i do the same as the video and i was copy every dot was the same. i modify both 5 circles the same time and its just keeps randomise the result . 

[Omar Domenech]

That is normal blender behavior, you just got to keep correcting the normals and check every now and then.

[Adrian Bellworthy]

Circles are notorious for giving flipped normals,

This is because there is no face when you add the circle, only vertices and edges…

It depends in which direction you extrude on what direction your normals will face.

If for example you extrude in the positive or negative Z direction

Positive Z direction…

And Negative Z direction…

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