How to program on a laptop with an external monitor?

Question

Monitors

Hello. I have had a 15" laptop for about 2 months now with a normal processor and RAM. I'm programming from a laptop in Python and PHP.
Recently I noticed that I get discomfort from the fact that the screen is too small and I was tempted to buy an external monitor for 24-26" . I have never worked with an external monitor before and I have no idea how it will look like.
I'm used to programming on one monitor, does it mean that I should turn off my native one? or get used to and work on two at once?
Is it convenient to work on two monitors of very different sizes?

Answer 1

do not be afraid) buy, then you will not be forced to work for one)

Answer 2

quite satisfied with one big one,
you buy another wireless mouse and keyboard, and here's a regular computer for you

Answer 3

The second monitor at the laptop is a salvation for me. It's not even about the diagonal, I would prefer two small monitors to one large one.

Answer 4

Both monitors can work at the same time. Before buying, pay attention to what external connectors for monitors are in the laptop, so as not to miscalculate later