BSOSF

the two methods are nutrient solution and sand/gravel method, if you could use diagrams ,it would really be helpful.

It would take too long to draw scan and post so the best I can do is point you in the right direction...

have a look at the link.

Nutient Film technique (NFT) but not heard of sand/gravel method.

There are flood and drain and wisk systems plus a few other techniques nowadays.