Glad to hear you are ok and yes, falling off happens to most of us sometimes. Probably was a bit of diesel, or maybe just the road markings. I tipped off many years ago while braking as I went over the road marking. As you ride more you will find that you start to feel the way the bike is on the road and without even realizing it will make small compensations so you don't tip over. Best of luck with your riding.
A man gazing on the stars is proverbially at the mercy of the puddles in the road.
Alexander Smith (1830 - 1867) Scottish poet
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