I need help, I want advice. Thank you

Friends of steemit, please whoever can advise me I appreciate it. I have been almost a month but I need to refine some formatting details in my text, they are the following details.

1 How is the texts justified? because I always publish them and the paragraphs are deformed and I do not see them with a good presence.

2.- How to apply the centered title? to highlight the main, secondary and tertiary issues.

3.- How to increase the size of the letters?

5.- And last but not least. How to put the photo to my presentation page in steemit?

Without further reference, please if you can leave links or some details to make my blog more attractive I would appreciate it

Sorry, my English is not very fluent I'm Latino and I hope to improve.