best theme blog way but some issue

Hi @pyaga

Please find answer to your points below.

1 ) – font size is very small how to increase font size
A: Please go to Appearance >> Customize >> Additional CSS and add following CSS

body{
    font-size: 16px;
}

Please add CSS for other elements as per your need.

2 ) – how to reduce distance between main artical and site title
– how to reduce distance between main menu and site title
A: Add following CSS

.sticky-top .main-banner {
    padding-top: 70px;
    padding-bottom: 0px;
}

Please adjust padding value as per your need.

3 ) – how to add ads below site title or below menu bar
A: There is no option to add ads below site title or menu bar. You can add it at sidebar or footer widgets.

4 ) i need left side site title no css working .
A: Please use following CSS

.main-banner h1.site-title,
.site-description{
    text-align: left;
}