Sir Don ... we all start out knowing not much and progress from there .... there are many very knowledgeable people who post to PPRuNe .. one of its main strengths ..... it continually amazes me just how little I know as I read what others post here ....
The only people who are dumb are those who think that they know it all and don't ask questions or ferret through the textbooks for the answers ..... keep an enquiring mind and you will do just fine ....