DataSolveProblems

<apex:page standardController="Account" recordSetVar="Accounts">
    <apex:pageBlock>
        <apex:repeat var="a" value="{!Accounts}" rendered="true" id="account_list">
            <li>
                <apex:outputLink value="/{!a.ID}">
                    <apex:outputText value="{!a.Name}"/>                    
                </apex:outputLink>
            </li>
        </apex:repeat>
    </apex:pageBlock>

DataSolveProblems

<apex:page standardController="Contact">
    <apex:form>
        <apex:pageBlock	title="Add contacts">
            <apex:pageBlockSection columns="1">
                <apex:inputField value="{! Contact.FirstName}"/>
                <apex:inputField value="{! Contact.LastName}"/>
                <apex:inputField value="{! Contact.email}"/>                
            </apex:pageBlockSection>
            
            <apex:pageBlockButtons>

DataSolveProblems

<apex:page >
    <apex:pageBlockSection columns="1">
        {! $User.FirstName} {! $User.LastName} {! $User.Username})
    </apex:pageBlockSection>
</apex:page>

DataSolveProblems

<apex:page showHeader="false" title="DisplayImage" sidebar="false">
    <apex:form>
        <table>
            <tr>
                <td width="1000px" height="600px" align="center">
                    <apex:image url="https://developer.salesforce.com/files/salesforce-developer-network-logo.png"/>
                </td>
            </tr>
        </table>
    </apex:form>

DataSolveProblems

public class NewCaseListController {

    public List<Case> getNewCases(){
    	List<Case>  cases = [select id, CaseNumber from Case where status='New'];
        return cases;
    }
}

DataSolveProblems

<apex:page controller="NewCaseListController" >
    <apex:pageBlock title="New Cases List" id="cases_list">
    
    <li>
        <apex:repeat  value="{!NewCases}" var="Case" rendered="true" > 
        <p><apex:outputLink value="/{!Case.ID}">{!Case.CaseNumber}</apex:outputLink></p>
        </apex:repeat>
    </li>
    
    </apex:pageBlock>

DataSolveProblems

<apex:page >
    <apex:image url="{!URLFOR($Resource.vfimagetest, 'cats/kitten1.jpg')}" />
</apex:page>

DataSolveProblems

<apex:page standardController="Account" recordSetVar="Accounts">
    <apex:pageBlock>
        <apex:repeat var="a" value="{!Accounts}" rendered="true" id="account_list">
            <li>
                <apex:outputLink value="/{!a.ID}">
                    <apex:outputText value="{!a.Name}"/>                    
                </apex:outputLink>
            </li>
        </apex:repeat>
    </apex:pageBlock>

DataSolveProblems

<apex:page standardController="Contact">
    <apex:form>
        <apex:pageBlock	title="Add contacts">
            <apex:pageBlockSection columns="1">
                <apex:inputField value="{! Contact.FirstName}"/>
                <apex:inputField value="{! Contact.LastName}"/>
                <apex:inputField value="{! Contact.email}"/>                
            </apex:pageBlockSection>
            
            <apex:pageBlockButtons>

DataSolveProblems

<apex:page standardController="Opportunity">
    <apex:pageBlock title="Opportunity Page">
        <apex:pageBlockSection>
            <apex:outputField value="{! Opportunity.Name}"/>
            <apex:outputField value="{! Opportunity.Amount}"/>
            <apex:outputField value="{! Opportunity.CloseDate}"/>
            <apex:outputField value="{! Opportunity.Account.Name}"/>
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>