Excuse the lack of the right words but I’m an new scrivener user.
OK so I imported a word file I’d been using and broken each ‘chapter’ into separate section under the novels ‘folder’
THEN I read somewhere that I shouldn’t have called them Chapter 1, chapter 2 etc as I have done.
What do other do in order to ensure that they can keep track of the plot ensuring everything happens in the right order, if not using sequential chapter numbers at this stage?
Thanks for your help and guidance.
Contrary to what you might have heard, there isn’t really a right or wrong answer here. What you might have heard is that Scrivener has ample tools for numbering chapters for you when you export, so that if you move chapter 23 above chapter 3, you don’t have to go down the whole list between those two points,fixing the numbers by hand. When you compile, things will just be numbered in the order of appearance, if you set things up to work that way.
But you don’t have to use it that way. 
If you prefer, you can type them all in by hand and maintain them manually, and set the compiler to just print the names without adding “Chapter #” in front of it. In fact, you can tell the compiler to not print the titles of items at all, and type in your chapters by hand in the text editor with a different font, more like using Word.
I’d say that depends on the individual as well, and has very little to do with technology. The same question could be asked of how one organises box of physical index cards with plot notes. Personally, I can’t imagine keeping track of the plot of a story using numbers. I’d rather just use descriptive names for items in the outline, not necessarily anything I’d want to have in the published output. “Joseph crashes the company helicopter in the mountains” is going to tell me a whole lot more about the contents of a folder (or text file, as the case may be) than “Chapter 18”. But to each their own—which is why we have tools like this that let you do what you want. 
I’m another who recommends descriptive titles rather than chapter numbers. Unless you are someone who plots everything before writing, and then rigidly adheres to the plan regardless, there’s always the possibility of chapters being reordered, added or deleted.