Why MQL5 reference material is so damn confusing?

[Claudio De Carvalho Aguiar]

I am an experienced EA programmer (100+ working EAs) and not so novice indicator programmer , and this is just a outbusrt. Everytime I try to learn or re-learn something in MQL5 I face the worst possible reference/help explanation text with worst possible reference/help examples. I have been trying for 2 hours to understand how to use DRAW_FILLING but the explanation text, example given in the reference material and in the article "THE DRAWING STYLES IN MQL5" offer such confusing and complex example that I give up trying to understand. Sorry for the outburst.