font weight

font-weight: bold;

p {  
  font-weight: normal;
} 
a {  
  font-weight: bold;
}  
p.thick {  
  font-weight: 780;
}

/* key word "lighter", "normal", "bold", or "bolder" */ 
.normal {
  font-weight: normal;
}

/* number between 100 and 900 */
.heavy {
  font-weight: 900;
}
  
 

/* Valeurs avec un mot-clé */
font-weight: normal;
font-weight: bold;

/* Valeurs relatives à l'élément parent */
font-weight: lighter;
font-weight: bolder;

/* Valeurs numériques */
font-weight: 1;
font-weight: 100;
font-weight: 100.6;
font-weight: 123;
font-weight: 200;
font-weight: 300;
font-weight: 321;
font-weight: 400;
font-weight: 500;
font-weight: 600;
font-weight: 700;
font-weight: 800;
font-weight: 900;
font-weight: 1000;

/* Valeurs globales */
font-weight: inherit;
font-weight: initial;
font-weight: unset;

font-weight: normal|bold|bolder|lighter|number|initial|inherit;

we can set text bold using css property named 'font-weight'
Syntax:
selector{
  font-weight: bold;
}

p.normal {
  font-weight: normal;
}


p.thick {
  font-weight: bold;
}


 p.thicker {
  font-weight: 900;
}

font-weight: 200; /*100 200 300 400 500 600 700 800 900 
					Defines from thin to thick characters. 
					400 is the same as normal, 
					and 700 is the same as bold*/

  
    p.normal {
  font-weight: normal;
}


 p.thick {
  font-weight: bold;
}


 p.thicker {
  font-weight: 900;
}