Quick Code Snippets of how to get Current logged in user ids in Salesforce
Apex
System.debug('Current User Id - '+UserInfo.getUserId());
Visualforce
<apex:page>
<h1>Visualforce Page</h1>
<p>UserId: {!$User.Id}</p>
<p>User Email: {!$User.Email}</p>
</apex:page>
Aura Component
let currentUser = $A.get("$SObjectType.CurrentUser.Id");
Console.log(currentUser);
Lightning Web Components (LWC)
Using wire
import USER_ID from '@salesforce/user/Id';
import NAME_FIELD from '@salesforce/schema/User.Name';
import EMAIL_FIELD from '@salesforce/schema/User.Email';
Formula Fields
$User.Id
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