When asking an open question you are in danger of getting even more confused because every person has their own settings based on the printer, temperatures and even the environment where the printer is located. Start off very simply with test files normally on the supplied SD card, don’t mess around with slicer settings until your knowledge grows and you fully understand the implications of making those changes. Stripping the 3d printing process back to basics it is surprisingly simple but if you jump into the settings from the onset you are heading for lots of frustration and failures. Also remember that one persons PLA temperature will be different to the next persons, its down to the manufacturer, printer and environment again. Learn to walk (very slowly) before you run… realistically you should be able to achieve results almost immediately. Forums etc can be a great resource however they can and often do confuse the issues by the vast number of options that people can apply to a problem and before you know it your head is ready to explode. If you have a problem then simplify it and search you tube (its surprisingly good) but more importantly you can see the solution.
I stopped giving hints and tips as it felt like I was contradicting someone, you’ve hit the nail on the head. I’m always learning despite some years of melting plastic to shapes I’ve designed. Like everyone I find the challenges very satisfying… 
…and just change one parameter at a time. if you change a few in the same print run you’ll never know which made iot better, or worse 
Yup, debugging 3d printing is a bad as debugging code.
I’ve popped in seen fantastic creations and requests being fulfilled and looked into getting a printer in the past, after @Banjonic did the husqvarna sign I was impressed.
I’ve been looking at the Bambu Lab A1 printer 
My question is that I want to fix things like a plastic hinge on a plastic door has snapped off, I know there is not going to be a file online for it as it’s part of a plastic door and what I would do is make the hinge with excess flat plastic to then weld with staples to the door, so how do you design one offs with the dimensions and be exactly same front and back is it the need to use CAD and have special tools if so I bin the idea as I’m to old to start learning that. Would a 3d scanner work and be easier as I’ve seen videos on it but sceptical it’s a straight forward as it looks.
For me, designing for yourself in CAD is always going to be favourite but then it’s sort of my job and I’ve been doing it for decades.
Not sure how viable modern 3D scanning for print production is; I suspect it must be pretty good these days. But I imagine you may still want to tinker with the model, so you’re back to some sort of CAD again.
There are probably plenty of folk on here that would be more than happy to do the CAD side for you, given suitable instructions to work from.
Finally, while the ability to pretty much design and print anything you might need, there are inherent limitations to 3D printed parts, mostly in terms of strength, due to materials and construction method. I’ve had a couple of “spare part” projects fail because although the parts were a perfect fit, they weren’t man enough for the task.
I should note that I’ve only used TPU and PLA, so there may be other options that fare better, but I have no desire to start using carbon fibre infused filaments, etc..
On the other hand, I’ve also had some great successes. You just have to pick your battles.
PS: Take a look at this thread. There may be one or two others on the topic as well.
Thanks Jez much appreciated with your reply, I have no plans in even starting to use anything like CAD, I tried doing a kitchen design on kitchen design program and measurements were simple and after hours of trying to get it right I binned it 
That’s good know on strength of the results as there is alot mainly to do with power tools and outside stuff where things get removed and lost.
Will look at the link
Never thought about it maybe my cub can do these small designs as he actually works for one of the biggest engineering and architecture firms in the world. I wiped his arse for long enough 