There are rules and there are Greek drivers - two different things! I remember the advice I got when I first came to Crete: "don't use indicators because it only confuses the Greeks".
The best advice I can give is to expect the unexpected! fF the car in front indicates right (or left) don't assume he/she will turn right (or left) - just hang back until the action is in progress. Hazard warning lights usually mean the car in front is going to park by going beyond the space and reversing in: just stop, give him/her room and be patient even if the fool behind is sounding his (never her) horn. Or of course, full hazards may mean they have just been left on and the driver has his/her mind on something else or is playing music so loud the warning beeps cannot be heard or is holding a phone.
There are many roads in Chania where many other roads cross them. The road signs will tell you if you need to stop and being a good UK driver you will - but don't assume a Greek driver will!! And, of course, any road laws appear not to apply to motorcyclists! My advice is if you are on the major road and all motorists on the crossroads must give way, don't assume they will but approach the crossroad with caution. Similarly, if a sign says you can't turn right (or left) don't assume traffic will only come from the right (or left) but look BOTH ways.
I was taught many years ago in the UK that, if you stop at traffic lights, apply the handbrake and put the gears into neutral and I still do just that. True, it preserves the clutch but it means that it takes a few seconds to get into gear before moving off and that gives the idiot driver or motorcyclist who is failing to beat the red, room to pass by. And ignore the idiots who are riding the clutch with one hand on the horn to "scream" as soon as the light goes to green. And pray for the motorcyclists who overtake the queue to stop right in front of you.
Driving in Crete, despite the idiots, is definitely easier than driving in the UK and is safer because, except on the National Road, speeds are slower and collisions usually just cause bodywork damage. Just be patient; don't be in a hurry, don't assume the one in front will do the logical thing and you will be just fine. But try to avoid driving when people are going to work or coming from work and, of course, avoid midnight to about 3.00 am when drunks are driving home.
When you can, give way to someone trying to enter from a side road and give them a big smile and a wave. They may well not thank you but you will feel better! As a general rule, I give way to taxis and any van - people who are working. Sheer bloody-mindedness causes me never to give way to drivers of big shiny cars, particularly those of German manufacture! As an elderly grandfather, getting a smile from a pretty girl (any lady under 60) makes my day when I give way!