You are right, it is very easy to become stressed nowadays, especially over tiny things that shouldn't really matter.
Generations ago people had common sense to help get them through situations but not so now. Stress is a boom industry! I've no doubt there are dozens of hubs on the subject.
There are 3 types of stress.
1. Stress caused by humans.
2. Stress caused by machines.
3. Stress caused by unreal situations.
I use a form of meditation to begin with. I step back in my mind, remove myself and look out a window to get a view, a bigger picture. I then focus on everything I see, a bit like an artist would if they were painting a picture. The idea is to get 'inside' the image. Could be a tree, a bird, a cloud, anything. This method is good for 1&2.
Second method is more physical. I take a walk or play table tennis or kick a ball around! Better for 1.
For the third type of stress I haven't any strategy yet!! Which is causing me more stress.