Guest posting

guest posting means writing and publish article on someone else website. to understand the guest posting first you need to know the basic terms about websites like what is domain rating? what is domain authority ? what does it mean by website traffic ?
so, i want from the beginners to please go the google search about DA,DR and traffic then in the comments section please define the terms. thanks

Thanks, DR is a metric to calculate your domain's ranking from a scale of 0to100 and so is PR but for in-between pages .
Source: https://ahrefs.com/blog/domain-rating/