Hi, newbie here and set up everything great, printed creality freebie test pieces superb. Found some files online, put them into cura and sliced and not had a complete print yet, some come straight off the bed, some get ½ way then turn into spaghetti and some miss bits in the middle and have trails of spaghetti. Do I have to change any settings on cura before I slice, if so to what and how do I know, I have added bed adhere as that seems to stop it coming off, but still spaghetti on the main part. I naively thought I downloaded a file and away we went perfect print 
any help gratefully received 
Hello
Yes, you need to download the stl files open them in the slicer program (Cura or whatever else you prefer to use) and change some of the settings before you save the print file and send it to the printer.
THIS may help and there are lots of YouTube videos out there as well.
Hope this helps 
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Sorry to be a pain but how do I know what to alter to what and why? There’s no info on downloaded file to say what to do TIA
You may find some help HERE or HERE
Changing Slicer settings can be very much a matter of trial and error and settings that suit one particular printer may not be suitable for all printers. There are Calibration prints to download and they can help with software settings. If you download a print file, read what the maker has said about printing. There’s often useful information about slicer settings such as whether supports are needed or what amount of infill is required.
Good advice is to check the slicer settings for each print. I’ve lost count of the prints I’ve ruined because I didn’t change raft settings or support settings from a previous print!
Don’t be afraid to experiment or change settings in the slicer software or printer to get the perfect print for your job. Maybe something with a large surface area doesn’t need a raft to sit on; Perhaps increase the infill density or pattern to add strength; Check the axis settings on your printer; Could a slower print speed improve the print quality. Try it on smaller print items to save filament but experiment and practice is the best way to learn. There are so many settings so don’t be afraid to change things. If the job doesn’t turn out right, change the setting and try again. If you get totally lost in the maze of settings, most slicer software and printers will allow you to reset things to the default settings.
Good luck
Many thanks for your reply and information, I guess I may need to read a bit more as maybe I’m still a little afraid of changing things, I did have a few that came off the bed so added bed adherence but then the print stayed on the bed but turned to spaghetti later, bear in mind I am a out of the box, set up printer newbie so alot of this infill etc is new to me. Maybe I was a bit naive thinking all I had to do was get a file and print the perfect print, oh well back to the head scratching 
.But thanks again for the info, all info is knowledge to me, steep learning curve.