LinkedInCrtl

public class LinkedInCrtl{
   
    public LinkedInParser lwrapper{get;set;}
    
    public LinkedInCrtl(){
       lwrapper=new LinkedInParser();
       fetchLinkedInDetails();
    }
    
     private void fetchLinkedInDetails(){
      HttpRequest req = new HttpRequest();
      req.setheader('accept','application/json');
      req.setEndpoint('callout:Linkedin/people/~:(id,num-connections,picture-url,location,Summary,email-address,publications,languages,skills,certifications)?format=json');
      req.setMethod('GET');
      Http http = new Http();
      try{
        httpResponse res = http.send(req);
        string responsestr=res.getBody();
        System.debug(res.getBody());
        responsestr=responsestr.replace('_total','total');
        lwrapper=(LinkedInParser)System.JSON.deserialize(responsestr, LinkedInParser.class);
       }catch(exception e){

      }
      
   }

}

SampleLinkedIn

<apex:page controller="LinkedInCrtl" sidebar="false" showHeader="false" >
<p>Summary</p>
<p>
  <apex:outputText value="{!SUBSTITUTE(JSENCODE(lwrapper.summary), '\\n', '<br/>')}" escape="false"/>
</p>
<apex:pageblock mode="maindetail" >
     <apex:pageblockSection >
         <apex:pageBlockTable value="{!lwrapper.skills.values}" var="skills"  title="Certifications">
               <apex:column >
                   <apex:facet name="header">Skills</apex:facet>
                          {!skills.skill.name}
                </apex:column>
         </apex:pageBlockTable>
   <apex:pageBlockTable value="{!lwrapper.certifications.values}" var="certs"  title="Certifications">
           <apex:column >
               <apex:facet name="header">Certifications</apex:facet>
                    {!certs.name}
                </apex:column>
    </apex:pageBlockTable>     
    </apex:pageblockSection>
</apex:pageblock>
</apex:page>