Suggestion for a cheap, leightweight Laptop?
As I want to code outside, the screen should be bright, SD Card Slot would also be nice.
I actually wanted to buy a MacBook, but the prices are...

Cheap & lightweight, with SD slot, I'd say the HP Stream. The problem with these is the hardrive that is pretty small.
Windows complains a lot for space, mainly when is trying to install the new nobody-knows-why-they-are-so-big updates, but with a light distro they might work good.

Maybe somebody else has one for developing purposes.

@antorqs I have. My suggestion; Don't get it.

The only two good things I got from that laptop is people found the color and design nice and one devRant rant.

@LastDigitOfPi you can move the cursor. It's also nice to touch. Like touching a small nipple.

@cursee I agree with the nipple opinion.

There is the Lenovo Thinkpad X1 carbon that is much better than a Mac..
And the Xiaomi notebook air 13.3 2018 that has a cool price/performance ratio (you can find it on Aliexpress)