Should there be any input restrictions on first/last name such as numbers?

I’m building a sign up form and I noticed that a lot of companies allow me to put in a number when I enter my first name, such as "alks82734" being a valid first or last name.
How should I handle user sign up when I need the firs…
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What is a better way to present sign up / login form?

It has become quite common and dare I say annoying these days to see websites and mobile apps prominently highlighting the ‘sign up’ for new user fields but at the same time why do they make ‘Login’ for existing users so hard to find?
I un…
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Best practices for mobile app registration and login

In terms of both registration login technology and user work flow, is there anything unfeasible or unwise with this registration configuration for a mobile app?
Phone or email
Password
Or use one-time passcode
Sign in with Facebook
Sign in…
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Should I add sign up after onboarding (customisation) or before?

I am creating UI for a recipe app. I want to include customisation. Asking questions about diet, allergies and time available for preparation.
Should I include login/sign up before or after this onboarding
process?
Is there a way to save …