can you check the what is the OWD ? may be issue with this?

there is a post in idea exchange https://success.salesforce.com/ideaview?id=08730000000I5NsAAK

So you need to use chatter api.

check this https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/connectapi_examples_post_feed_element_mention.htm

ConnectApi.FeedItemInput feedItemInput = new ConnectApi.FeedItemInput();
ConnectApi.MentionSegmentInput mentionSegmentInput =…

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you can use webservice to send email. onclick of javascipt button call a apex class and send the email to related contacts

check this example for more info https://developer.salesforce.com/docs/atlas.en-us.workbook.meta/workbook/button_1.htm

if you don’t want to use describe call etc then you can use eclipse to view all the fields name

And for all standard objects you can check the soap api documentation  https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_acceptedeventrelation.htm

if you are looking for feature like sql select * from table_name then I say no. In salesforce there is no feature like that. And if you want to create a utility class where you can pass the object name and get the all field and prepare soql query with all fields then solution is use decribe call to get the all fields name.

 

SObjectType…

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if this is the standard page then you can’t do it. You can populate those field using workflow rules or process builder . based on contact value get the all details and update the record.

This is really broad question. I suggest to check this example

https://developer.salesforce.com/page/Wrapper_Class

I suggest to use apex:inputcheckbox . Using this component you can bind the value easily

 

 

https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_inputCheckbox.htm

check this post https://developer.salesforce.com/blogs/developer-relations/2015/10/important-change-to-lightning-components-in-winter-16.html