I'm looking for a laptop up to 300 euro that fits this budget well
Lenovo has good ones
Define "good". Do you just want to surf or do you want to play challenging games?
To work
Pick one: https://www.notebooksbilliger.de/.../notebooks
Or check eBay for a used one.
I would look around for a used one. Would be nervous after a week if I had to work on a laptop with a Celeron or Athlon processor and without an SSD.
Joke… More concrete have to answer
Example: A question about a "good car" can't be answered just like that. A sports car is good, but not suitable for transporting a refrigerator.
To work with a video conference (e.g. Teams) to give presentations at powerpoint etc.
Then you have to pay attention to the graphics card. Unfortunately, I can't help with the exact details.
