to make titles etc;
https://guides.github.com/features/mastering-markdown/
it's rather easy, have a look

biggest title is '# '

big title is '## '

medium is '### '

etc

it's not much and very straight forward, less than 2 minutes to learn it

and you should change 1 of the tags, you used; introduceMYself, while it should be ... introduceYOURself

that's why nobody can find it like they did with your previous post ... change it!