On the horses' individual form screen what do certain symbols mean?

After the date of the run there are sometimes little triangles coloured either pink,red or blue, what do these mean?

After the rating of a horse in its' line of form I have a blue spot with a black G in it, what does this mean?

Before the placing that a horse got in its races ie. 3/23 there are brown dots before some, what do these mean? I realise the ones with a white 1 mean the horse won the race, at least I'm 99% sure of this, but what are the other brown dots for? Does it mean horse was placed? If so, I have times a horse was 3rd but gets no brown dot.

Finally, and this is not to do with form page, how do you set a stable jockey? and how do you set an apprentice? and are apprentices any good?

Any help would be much appreciated.

Many thanks in advance.

I dont know what the little triangles mean.

The blue spot with the black G comes up on the horse profile page after its first run as a gelding.

The brown spot means placed and the times youve been third and not got the spot, there probably wasnt enough runners for 3 places.

For stable jockey, somewhere up the top left it says Retainers, click on that, then click on the jockey you want from those available and then click Hire Jockey down the bottom. Same for apprentices and some are good for handicaps.

Red indicates the horse was unsettled or boiled over before the race
Pink indicates the horse was agitated and unsettled before the race
Blue indicates the horse was relaxed before the race

Thanks for the help guys. The points in question weren't game spoilers, but curiosity nearly killed the cat Thanks again