I am coming up with a freelance platform like eassaypro using .NET, I'm thinking about the best database to use. Could you please advise?

I've recently done 2 interviews in the past 2 weeks, I did 3 stages for the first one and failed the last stage. I felt devastated. I did the 2nd one Which had written and oral, I feel like I failed oral,results are yet to come out. I have 2 interviews next week and I have no energy to prepare. I feel lost and tired of preparation.

Has any one used spell checker library on nuget package?
My supervisor wants it but I could easily use Javascript plugin.

How do you handle the project you do not much about first week on the job?

I need help on how to get number of audio channels in c# or Javascript

I'm anxious and always not good at interviews. What can I do plz.

I'm developing a small project using C# web Api as backend.. What's the best front end using same IDE(Visual studio)?

What software methodology do you work on your pet projects?.. I'm a newbie and I'd like to get some rough ideas..

After learning and creating a web app with mvc framework what do you think I should further learn? Especially to be good at job market or creating pet apps?

What js framework is best for .NET?

I feel like I am not good enough when it comes to Dev interviews but I code pretty okay for a beginner/intermediate..I have developed an app which works almost end to end but I fail most of the interviews.

What's the fundamental difference between NET framework and NET core?

That I'm going to find a bug while doing a DEMO to all client..