How do I add bleed to the image borders for print? Do you have any other advice on how to prepare my image for print on hardcopy?
I am new to Krita. Thank you!
Hello and welcome to the forum 
One simple way is to do Image → Resize Canvas then you can add a pixel value or a percentage increase to the canvas size (and a positioning offset) and the edges will be filled with the standard Background colour layer (which is effectively infinite).
Before you do that, do Image → Trim to Image Size to remove any off-canvas content that may have accidentally been made, which can easily happen when painting.
I suggest that you experiment with those to get used to them.
Other people here who are used to professional print workflow may have more advice.
Thank you so much for the warm welcome and for your advice.
I’ll try it out, thank you!
Once you are done with the painting. You have to ask the print-shop or the person who is going to print your artwork the colour profile the printer is going to use. Use that colour profile to soft proofing. Soft proofing is checking if any of the colours is going to be printed as intended. And if some colour is out of the range of the given colour profile you will need to adjust it to bring it closer to your original colour.
You can check colours while painting too. read more about soft proofing here - Soft Proofing — Krita Manual 5.0.0 documentation
You can access the soft proofing setup from the image menu > image properties > soft proofing section
Keep in mind that Krita doesn;t provide any CMYK profile other than chemical proof, and chemical proof is not the profile that your printer is going to use. Often time the target colour profile is dependent on region or varies from printer to printer. So ask the correct colour profile file from the print-shop.
Once you have set it up, Krita will show you all the colours that are out of the colour profile range in green colour as selected in the gamut warning section here in the dialog above.
It is better to save a separate file to adjust colours and convert your file to CMYK colour profile the printer has given you. Most of the time you do not need to do this conversion as print-shop provide this service these days.
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I see, thank you so much for sharing. I will look into that.
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