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Besides romanized Nepali unicode, the most popular way of Nepali typing is using Nepali fonts (mostly Preeti and Kantipur) and traditional Nepali unicode whose layouts in English kayboards are almost same.
Please find the layout for Nepali fonts and traditional Nepali unicode typing.
On the other side, you can buy the physical English Nepali Keyboards from the market so that you can practice Nepali typing more conveniently. Oh, ya do not forget to practice typing on Preeti Font Typeshala.