Explain in detail the floral diagram and how to remember things as it is very complex

See there are 3 families to do: Fabaceae, Solanceae and Liliaceae. Fabaceae Features are:

• It is Zygomorphic plant so indicated by %
• Sepals are 5 in number and fused so you represent it as K₍₅₎
• Corolla have vexillary aestivation (1- standard, 2 alae petals which are unfused and 2 fused keel petals) so indicated by C1+2+(2)
• Androecium are diadelphous meaning 2 bundles- 9 are fused in one bundle and another bundle just has 1 stamen so written as A₍₉₎₊₁
• Superior single Gynoecium is written as G₁

I hoped it helped you. Similarly you can do for other two families. Just see the floral diagram and write the formula