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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Bad practice for dropdowns to cover buttons?

I have a text field that shows matches in a dropdown when the user starts typing. Below the field are buttons. When the dropdown is activated it covers the buttons. However the dropdown will go away before the user will need to select the …
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UX for picking tags and then quantities related to them

I’m making an app in which students can select topics/tags they’re interested in, and get a randomly-generated quiz containing questions that have those tags/belong to those topics. For each selected tag, the user must also be able to expl…
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Hyphens vs. parentheses in form field labels

Link Color
Link Color – Hover
Header Items – Left
Header Items – Right
vs.
Link Color
Link Color (Hover)
Header Items (Left)
Header Items (Right)
vs.
Link Color
Link Hover Color
Header Left Items
Header Right Items
Are there any rul…
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Enabling fields in general section (at top) based on details selection (at bottom)

Is it bad UX to display/enable or mark mandatory fields in the general section (at top) based on details selection which is placed at the bottom?
If yes, what are the options we have in this situation?
Selecting an option in the table at t…
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Filtering: Input-fields or buttons?

I’m currently working on new tables for our web platform. I came to a point when I need to design some filtering options as part of the design. One of our developers told me to use a text field that opens a menu since he already developed …
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Design for input of time-series data

I’m designing an application page where the user can input multiple time series.
As an example, this can mean updating the daily product forecast for a 5 stores over the next 14 days. This results in 5 different time-series to be updated, …
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Masked inputs – to clean or not to clean?

What are the arguments, from the UX perspective, to clean or not to clean masked inputs?
Consider credit card validity:
_ _ / _ _
Partially filling that field makes no sense, the partial value has no business meaning, and might be technica…
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Multiselect in separate page

I have a big form with like 16 inputs, going from basic inputs, selects and multiselect. Now I want to reduce the cluttering for the user by moving the more advanced inputs such as multiselects to another page or fullscreen modal, so like …
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Can a form field have different radius from the button?

Can the email address field have a different radius from the button?
We have pill-shaped buttons across the whole website.
But I didn’t want to make the email address field with the same shape seems doesn’t look great.
So my question is: A…