How to retrieve data using relationship in laravel?

I have following tables

users

id|username|email|password|

posts

id|post_name|post_content|category_id|user_id|tag_id

categories

id|category_name

comments

id|comment_content|post_id|user_id

tags

id|tag_name

Post Model

class Post extends Model
{


    public function comments()
    {
        return $this->hasMany('App\Comment');
    }

    public function users()
    {
        return $this->belongsTo('App\User');
    }

    public function tags()
    {
        return $this->belongsToMany('App\Tag');
    }

Comment Model

class Comment extends Model
    {

    public function posts()
    {
        return $this->belongsTo('App\Post');
    }


   }  

Tag Model

class Tag extends Model
    {
    public function posts()
    {
        return $this->belongsToMany('App\Tag');
    }

Now my question is how i can access all comments that belong to post with commented username and tags belongs to that posts

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