I'm a beginner so I haven't really tried anything yet, except for these: https://web.dev/serial/ https://learn.microsoft.com/en-us/dotnet/api/system.io.ports.serialport?view=dotnet-plat-ext-6.0
RFID reader: https://www.amazon.com/gp/product/B07YZ8NW22/ref=ox_sc_act_title_2?smid=A24KK1JV764V60&psc=1
But they haven't worked for me. Can someone give me some pointers on or even better help me writing a program that receives data from the serial Port and somehow sends data to a database?
Resources I currently have: Rpi and beginner knowledge in JavaScript and C#
Edit: I want the RFID-reader to read tags, and maybe use a Rpi to send POST-HTTP Requests containg the tag information to a database. I have received a SDK from the manufacturer in different languages(C#,
You should start by asking the manufacturer if they have a developer manual or maybe an SDK to use in your application. Depending on what exactly is your requirement, it will help you to determine which programming language to use, but I would say C#.NET is a good choice, whether you want to program a windows application or a middleware (Windows service).
I hope this may help you.