I agree with Dawn, I could recommend the course I did (18 week VTCT Nail Treatments) to you but it really would depend on how YOU prefer to learn, finances, timescales etc.
There are lots of different opportunities to do training in this area but it depends on how deeply you want to go into the theory side, such as: skin, bone structure, blood flow.. The course I did was good for this and gave the opportunity to develop skills in the use of nippers and application of polish (especially french).
Do a search on here as Dawn says and have a good read
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