the day when the temp went up to 36.8 could be considered the first high temp, and then it stayed up for three consecutive days. So it means you Ovulated on the day before that when it was 36.4, at the latest. Some might say you even o'd the day before, since it went up from a nice low drop of 36.1 to 36.4. But I'd say you def O'd on the day of 36.4 at the latest.
I think your temps look good to me from the few we've got to go by. You are not going to have much of an idea of PG temp patterns for some time yet

If I were you, I'd test on the morning of when you have had 12 high temps. If it were me, I'd be saying 36.8 was the first 'high temp'.
If you go to Fertility Friend, they have online tutorials etc on all aspects of charting. I have been charting for about 8 years now, but am only just new to Fertility Friend, and I really do find them EXCELLENT
Re the one decimal place. Most on here disagree, and certainly two decimal places is obviously more accurate, but I learned from a small team of fertility specialists years ago, and they taught me one decimal place. The rise needs to be a minimum of .2 degrees celsius, and the thermometre they gave me only went to one decimal place. However now I have a new thermometer which does go to 2 decimal places, and since I'm using FF, I'm using two.
All the best. You'd come to the right place in here, there are some well informed ladies. But I'd spend some time in FF too.
HTH