Maybe also look ip a good component library, for C# I use MudBlazor, which has great documentation that helps a lot to pick the right component for the job, and a lot of the hard work is already done in terms of styles/themes.

For my apps I use the MVVM pattern and write all the backend logic first, then that helps me narrow down the right way to display it.

It’s not that bad, you might have a couple of moments where you suddenly second guess yourself, particularly on smaller country roads, or car parks. Just remember you the driver should be nearest to the center of the road and you’ll be fine. If you pre book you might have a chance of renting an automatic to make things even easier.

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tldr: he uses offensive programming

I also had this issue, and I think it was because I used my email address instead of username, which works initially but breaks later. Deleting app and logging in with username fixes it.

Assuming this is C#, you could just make Reservation a record type, which can be defined with a one line primary constructor, is immutable and has value type equality. Second example is an insane amount of boilerplate.