Which IDE was your first when you started coding?
My first one was Notepad++ on Windows then Xcode on MacOS, for a year I've been using only Visual Studio Code with many plugins.
I thing it was Borland Turbo C++ 3.0 for MS-DOS.
It had syntax highlighting, integrated help with full language and API documentation. Which was useful because I didn't have Internet access back then, at the beginning of the 1990's.
I had to buy a new PC with an Intel 386 CPU, and add "extended memory" to run the IDE. It couldn't run with only 640 Ko of RAM.
Turbo Pascal 3 for DOS was the first thing that could be called an IDE that I used, but not the first programming environment.
Pencil and paper with lots of boxes that we drew, with boxes inside them, and boxes inside them, all the way down because proofing code; sometimes you could get funky and draw boxes from the inside out.
Mine was a single, blank screen with a prompt and flashing cursor on a Tandy Model I.
Not sure you'd call it an IDE ...
ISPF on TSO (IBM mainframes), assuming that punch cards and mark sense cards don't count.
In doing cleaning and purging on the house, I just found something I forgot I had: an ISPF implementation for use on MS-DOS!
Sinclair BASIC on ZX Spectrum
AHAHAHA
blue j. Ah the joys of java.......