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Most things you are soldering will perform OK - wire, components, tags, plugs - but sometimes you are trying to solder something to which solder doesn't really "take". A classic problem are "chromed" type surfaces. One example is the earth connection in some cigarette lighter plugs. It doubles as the spring to hold the plug in place and examples I have had have been difficult. If, even after following the guidance below, the solder stills continue to "ball" on these, you may need to get in with a file and break through that surface to expose some bare metal that will take solder.
ps. I concur re getting enough solder on the iron before you touch the job. Heat transfer to the job is much improved if a good area of liquid solder is in contact with the job.
pps. don't solder with a fan or air conditioner blowing on the job, unintentionally or otherwise - they cool it too fast.
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