Q.Our Trees Are Dying And We Don‘t Know Why Or How To Fix It
We moved to our House in London some months ago, and the two trees in front of our house were already there. They had some brown leaves already but it got very much worse now and there are also some webs. In the pot there was a lot of grass and some other plants which I ripped out now. I am an absolute gardening beginner, I don‘t even know the species of the tree or what soil it needs or how much water. Would appreciate any help on how I can help the trees very much. I included some pictures. Thank you very much in advance, Kind regards

Certified GKH Gardening Expert
They look like Laurels. They look like they have been diseases for some time, as well. By this time, there will be no cure for an infection that far along.
It will be time to look into replacing those.
Should you still want to attempt, which may give you a few more years of life from it, you will need to treat with a fungicide yearly, as well as keep up with pruning and insect control. Diseased shrubs are not resistant to such attacks.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/shrubs/cherry-laurel/growing-cherry-laurels.htm
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm