<apex:page standardController="Opportunity" recordSetVar="opportunities" tabStyle="Opportunity" 
sidebar="false" extensions="CloneQuoteWithPriceIncrease" action="{!redirectToLWC}"> 

</apex:page>

standardContoller="Opportunity" (mandatory)

This will allow you to put your button on the opportunity tab list views

recordSetVar="opportunities" (mandatory)

This will allow you to get the selected record of that list view
You can give any name instead of "opportunities"

tabStyle="Opportunity" (optional)

this allow to see this vf page in Opportunity tab view.

public with sharing class CloneQuoteWithPriceIncrease {
    public List<Id> opportunityIds { get; private set; } // Store the list of Opportunity IDs
    private final List<Opportunity> opportunities;

    public CloneQuoteWithPriceIncrease(ApexPages.StandardSetController controller) {
        // Retrieve selected opportunities
        this.opportunities = (List<Opportunity>) controller.getSelected();
        
        // Extract the IDs of the selected opportunities
        this.opportunityIds = new List<Id>();
        for (Opportunity opp : opportunities) {
            opportunityIds.add(opp.Id);
        }
    }

    public PageReference redirectToLWC() {
        // Construct the LWC URL with opportunityIds as a parameter
        String lwcUrl = '/lightning/cmp/c__cloneQuoteWithPriceIncrease';
        
        // Add the Opportunity IDs to the URL as a comma-separated string
        if (this.opportunityIds != null && !this.opportunityIds.isEmpty()) {
            lwcUrl += '?c__opportunityIds=' 
			+ EncodingUtil.urlEncode(String.join(opportunityIds, ','), 'UTF-8');
        }

        // Redirect to the LWC
        PageReference redirect = new PageReference(lwcUrl);
        redirect.setRedirect(true);
        return redirect;
    }
}

Constructor: ApexPages.StandardSetController (mandatory)

This allow us to get the list of selected records and other details like which filter is used etc..

getSelected()

this allow us to get the record which gets selected on list view.

Happy Coding!
divyesh dudhat