I ride and develop foils for around 4years now.
Learning foil take some sessions (I expect 3-4days) to manage well the foil.
The main target is to manage the balance of your center of gravity to control the foil
For that the best is to pratice with a production foil and maybe only one strap for the front foot.
First trials, you should learn to glide without using the foil effect to control the leverage of the foil.
After that it takes some trials to find the best balance on the foil.
I'm jsut back from the french racing championship and finish 2nd of the Open Categorie, riding the ZEEKO Makaira foil, but strapless to have the maximum of freedom!
One pic here (foil is production one Makaira)
Here in France: the 8 first riders used a foilboard,
On the internationals contest, foils are forbidden. Please push to introduce foil on racing contests!!!!
short video about how to use it: