i can't code and i don't get so much about

what i mean is that i don't get how grow to grow tree if make one of my own blocks to use and i dont get it so much from the biomes even i don't get how to make models in 3D if do i get error and i don't get it form simple code line then i don't get it even i haven never learn of and know there webside buti can't still not get it all i only how make ores or tools and make little machine and sill i dont get it so much even still don get all the code how can i make something more like all what can do how can it if still don't get it what can i doing if can't not get help of it even if tell me thati have follow video or learn code i stll don't get it if want my mod better  

( sorry for miss spell it that have problems in both netherlands and english )