What can you upgrade on a laptop?

Hi, I have a laptop that is older and not so fast anymore and a key comes off easily every now and then, can it be repaired? So I was wondering what can be done to improve a laptop to make it perform well again?

There are USB ram and additional processors that you can simply plug in.

a 3090 via USB is also available to simply plug in with water cooling, also to plug in

On a laptop you can usually only swap the hard drive for a larger one and upgrade the memory.

an SSD hard drive brings a significant increase in speed for booting the operating system compared to a mechanical HDD; This is not particularly relevant during operation.

everything else is permanently installed and can only be converted by an expert with soldering experience and fine mechanical talent; but not worth it.

Unfortunately, it doesn't work because it would be so expensive and many laptops can't do that either.

You can also just clip on a new laptop

Not a lot and that also depends on the device.

HDD / SSD can often be exchanged, many also offer the possibility of exchanging or expanding the RAM. Some also offer additional SSD slots in M.2 format.
Often you have to open the notebook completely, and not all of them have corresponding maintenance hatches.

Few models also allow you to swap CPU and / or GPU, but these are usually very expensive models and have formats, so you can buy a stand PC right away.

If something can't be exchanged, it is soldered and can only be upgraded with a lot of specialist knowledge, experience, time, the appropriate special tools and the appropriate hardware.

In general, you don't buy a notebook to upgrade, that's just not what they are made for.

What is there are outsourced components, e.g. An external SSD or an external graphics card.

Yes, but then you already have a new laptop.

But then you run the risk of the old device feeling repulsed. You shouldn't hurt the feelings of your longtime companion °!

Is that true, I forgot.