Has anyone created a trigger to populate the long/lat fields for location with a trigger using something like the Google API and the mailing address fields\?

The following challenge does not validate:

Quick Start: Lightning App Builder - Add Quick Actions and Activate the App
Error: One or more of the quick actions were not added to 'Field Sales App' 
https://developer.salesforce.com/trailhead/project/quickstart-app-builder/quickstart-app-builder4

This component works but does not validate and gives the following error message:
Step not yet complete... here's what's wrong: 
The CSS does not contain a reference to the background image 
Note: you may run into errors if you've skipped previous steps.

I completed this task but it does not validate.
I completed all modules and they validated with the exception of this.

I'm competent with the declarative model and learning Apex and Visualforce which are pretty straight forward but now that I'm working on the Intermediate dev trail it looks like I need to also learn Javascript and related libraries, html-5, css etc.

I'm competent with the developer console and can navigate the Eclipse IDE but have more work to do with Eclipse to become competent.

I'll have completed all Trailhead modules next week and am starting on some advaned books and workbooks to get more under my belt.

I developed an Appexchange app a few years ago and plan to refactor it with the latest declarative tools along with what I'm learning in coding.

I did not code the app but was the developer.

Thanks in advance for your advice.

What do you recommend?

The "Customizing Compact Layouts" challenge posts credit but gives an error message:

 

Trailhead excercise: Customizing Navigation, Buttons, and Links in the 

Error message:
Challenge not yet complete... here's what's wrong: 
The 'Google Link' custom button was not found.

I created the button exactly as instructed. It exists, works and is on all Contact page layouts.

Please help.

This component works but does not validate and gives the following error message:
Step not yet complete... here's what's wrong: 
The CSS does not contain a reference to the background image 
Note: you may run into errors if you've skipped previous steps.

Hello,

I am passing the maintenance exam for my dev 401

Salesforce.com Certified Developer: Summer ’15 Release Exam

What are official resources i should refer to be sure to pass the exam ?
 

This component works but does not validate and gives the following error message:
Step not yet complete... here's what's wrong: 
The CSS does not contain a reference to the background image 
Note: you may run into errors if you've skipped previous steps.

I completed this task but it does not validate.
I completed all modules and they validated with the exception of this.

I'm getting the error "The outputLink component is not binding to the ID of a case" for this challenge. I've checked several threads on here and I'm almost certain it should be correct. It does link to the details page for the case. 

I initially just had the ID linking but have changed it so both case number and id link via id in case that mattered. 

I've also previously tried having a complete url as the value but no luck. 

Any help would be appreciated.

<apex:page controller="NewCaseListController">
 
        <apex:pageBlock title="New Case List" id="cases_list">
            
    <apex:repeat value="{! newcases }" var="cases">
       
        <apex:outputLink value="/{! cases.id}">
        ID:  {! cases.id }
        </apex:outputLink><br/>
        <apex:outputLink value="/{! cases.id}">
        Case Number:  {! cases.CaseNumber }
        </apex:outputLink><br/>    
    
    </apex:repeat>
            
        </apex:pageBlock>

The "Customizing Compact Layouts" challenge posts credit but gives an error message:

 

Trailhead excercise: Customizing Navigation, Buttons, and Links in the 

Error message:
Challenge not yet complete... here's what's wrong: 
The 'Google Link' custom button was not found.

I created the button exactly as instructed. It exists, works and is on all Contact page layouts.

Please help.

I continue getting an error on the Workflow Rule in the Trailhead excercise that says a workflow field update action was not found, but I have created it.  

Challenge not yet complete... here's what's wrong: 
The 'Set Case to Escalated' Workflow field update action was not found.
Create a workflow rule that will update a field.In some instances, a case must automatically escalate. Create a workflow rule that will set the escalated flag and send a task to the case owner, if a case is not closed and its priority is set to High.

Can someone please help me with this? What is the correct formula for the workflow itself? Perhaps the error is in my current formula.
Thanks!