Support co-authoring with SharePoint list item - sharepoint

Can we support co-authoring with SharePoint list item? Simultaneously updating an item with 2 people in real time?

You could enbale vesrsioning for the list in list versioning settings. So you could keep track of changes to list item through list item history.

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Converting SharePoint List Form to a PowerApp

I'm looking for input on the best approach to converting a SharePoint list form to a PowerApp. The list currently has the following field type:
15 text fields
5 choice fields
5 multi-select choice fields
3 multi-line text fields (not rich text)
There are 20,000+ items in the list, with 1k+ new items added every month.
When creating the PowerApp, should each choice field be converted to a new list? I'm wanting to make the fields as dynamic as possible and avoid hard coded values.
I'm not opposed to moving all of the list items to a CDS entity if it helps.
You can use PowerApps to customize the SharePoint list form. There is a command in the command bar of a modern list to do that
If you don't want to use Choice fields, you can use simple text fields and in PowerApps connect to SharePoint lists as the source of the dropdown options. Then you can let the end users maintain the values for the dropdowns easily.
With this approach, the SharePoint list maintains all other functionality, i.e. you can use list views and embed list view web parts in SharePoint pages. A customized form will not work on a mobile device, though.
You can also build a stand-alone PowerApp that stores items in the SharePoint list. This is independent of the SharePoint list form customization. Such an app could be used on a mobile device, but there are limitations around the number of list items that the app can pull from the SharePoint server at any one time. It may not be suitable for big lists.
PowerApps is easy to learn and there are lots of resources just a web search away.

Is it possible to update an item using list id instead of list title in the SharePoint designer workflow?

I am trying to update an item in a different list if any change event occurs on the source list item. I have different list id for different items on the source list that's the reason I wanted to update item using list id instead of list title. Is it possible to update an item using list id instead of list title in the SharePoint designer workflow 2013?
You could call rest api /_api/web/lists/GetByTitle('listtitle')/items(itemid) to update list item by 'Call HTTP web service' action.
You could refer this thread for sample.

Can we ensure that whenever there is an update to an item on master list, the same item should be updated

Is there a way in SharePoint designer 2013, I can ensure that whenever there is an update to an item on master list, the same item should be updated in the copy list of the master list in other site collection. I have a master list in one site collection and copy of it’s in other site collection?
Out of the box, no. But there are some 3rd party tools, and coding options discussed on a SharePoint StackExchange posting: https://sharepoint.stackexchange.com/questions/139417/workflow-create-list-item-to-another-site.

Update multiple SharePoint list Items

I have an InfoPath form that, when submitted to a SharePoint Form Library, also adds a single item to a Task List. Each item in the Task List contains a People field that may contain multiple names. I have code in the form that creates separate items in a Custom List, one for each name in the People field.
When I manually update the Status field in a Task List item, I would like a SharePoint workflow (I'm using Designer 2010) to update all of the Status fields for the corresponding items in the Custom List. The "Update list item" option in ShP 2010 workflows will only update a single list entry. Is there a way to update all of the Custom List items that correspond to the Task List item whose Status is being modified?
To update multiple list items simultaneously, use SharePoint batch update. Look at following links for more information:
MSDN - Visual How To - Batch Updating List Items in Windows SharePoint Services 3.0
http://apmblog.compuware.com/2009/01/20/sharepoint-using-batch-updates-to-speed-up-performance/
You can also use batch operations for inserting and deleting.
I have written two workflows on codeplex - one is https://rwomi.codeplex.com and one is https://umlisdw.codeplex.com/

Multiple copies of a Sharepoint list view

We have a Sharepoint website with a different page for each of our products and another page displaying a list of all our product release dates. You can change the view in this list so that only the release dates of a particular product are shown.
Is is possible to have a list view showing release dates of one product show up on the page dedicated to that product? We would like to have each product page show its own release dates, but if someone updates the master list, each individual product list should be updated as well.
You would want to use the dataview webpart to view a "master" list. You will be able to define a different filter for each webpart. With XSLT you are also able to completely customise the output of the HTML, but I prefer to use only one to avoid all the work.
A simple way to make the master list available on the product pages is to syncronize the content of the master list into a hidden list on the product pages, you could use a Event Receiver for this. This solution will require some custom code but it is pretty simple.

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