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Using Bootstrap and ng-bootstrap is good?

I have two modules in my angular website , one is "bootstrap" and another one is "ng-bootstarp".
Does both modules are required , or any one is needed?
I am planning to keep only "ng-bootstarp" 4.0.0.0 and to remove "bootstrap"
Is this fine?
Also let me know the steps to remove "Bootstrap" ?
Can i just go ahead and delete the bootstrap from the ng_module folder or do i need to use any commands?

Don't delete it unless it's causing issues, Bootstrap is intended to be installed alongside ng-bootstrap.
Bootstrap is supposed to be installed when using ng-bootstrap, because ng-bootstrap
relies on Bootstrap's CSS, but it replaces everything else that comes with Bootstrap, as you can see in their dependencies. The CSS is then set in your angular.json or imported into the main styles.css
That said, the non-CSS parts of Bootstrap are unused and could be deleted, but if you're using a package manger, e.g. NPM, this could cause issues when updating and you'll need to repeat this process each update.
As pointed out by #Eliseo, an alternative to using the normal Boostrap with everything included is to use bootstrap-only-css, which can be installed using NPM or Bower, details here. This isn't an official Boostrap distribution as far as I can tell, so keep that in mind.
TLDR: there's no good reason to delete Boostrap.

Angular Material is the official UI framework for Angular, and is maintained (aside from open-source contributors) by Google engineers.
The community is fantastic, the documentation is excellent, and all of the components and utilities are designed to be used with Angular specifically. The source is a case-study in how to write code the Angular way.
It is for the reasons outlined above that I picked AM to be our company’s preferred UI framework.
I haven’t used Bootstrap in a very long time and I would not consider using it in a new project now.

Angular2 JQuery Plugin Integration

Though this question asked quite a few times, there is no clear answers. I am beginner in Angular2. Please correct me if I am wrong. Is it wise to integrate JQuery plugins with Angular2. Imagine a JQuery plugin like JQuery UI with no proper typings available. How to implement that in Angular 2. What are the problems of using JQuery with Angular2. This question is already asked but answer is not useful.

It's clear and obvious that jQuery and
Angular are two different frameworks written above JavaScript. So it
is not recommended to use both the frameworks at same time on a single
project (either use jQuery or use Angular).
There are UI components available that are re-written using Angular without the dependency of jQuery. You can check ng-bootstrap and ngx-bootstrap which have almost all Bootstrap components written completely with Angular.
Alternatively, there is another complete UI framework for Angular based on Google's Material Design specs named Angular Material. Currently Angular Material for Angular 2 is in beta.
Also there are bundle of official UI resources that you can use and drive smoothly with Angular.

Bootstrap framework without jquery

I have requirement to develop a front end project. I am planning to use angular + bootstrap. I don't have to use jquery, but bootstrap javascript components require jquery. my question is,
1)Can we have bootstrap built on javacript.
2)Can we have bootstrap built on angular.
please provide related good documents on any above two related topics.

For angular project you can user UI Bootstrap which have bootstrap CSS file with a set of native AngularJS directives.It does not require jQuery or Bootstrap's Javascript.The only required dependencies are:
AngularJS
Angular-animate
Bootstrap CSS
Check it here

Have no worry, the internet is full of scripts and tutorials, native JavaScript is the coolest programing language ever! Far more powerful and requires almost zero maintenance on very long periods of time.
Also some features are even better.
If you are looking for Bootstrap without jQuery or vanilla Javascript for Bootstrap, you can use bootstrap.native

The Bootstrap plugins are jQuery plugins, so no, strictly speaking, you can't use them without jQuery. There is this project, however, which may help you.

When building out Angular projects, you should not add on the full jQuery library. jQlite is already included in Angular and this should be all the jQuery that is necessary.
Reference

AngularJS and jQuery... What's wrong with using both?

I saw a few blog articles saying that AngularJS and jQuery could be used together in one app. That seems good as jQuery has some functionalities Angular doesn't have and Angular allows us to make a greatly structured logic for a web app.
The fact is, as I'm french I also take a look at french blog articles about that, and french tends to say that we should never use jQuery and Angular together. I asked why on a forum and people said that it's probably because beginners usually use jQuery and Angular for the same things : adding elements dynamically, use ajax requests, etc... But I'd like to use jQuery for some things Angular does not do and to allow bootstrap js to work on my app.
What do you think, are jQuery and Angular bad at working together in one single app? Or does it just depend on how we make them work together?

AngularJS uses JQuery itself, the major reason not to mix and match is just what you described of them stepping on each other's toes.
While I was learning Angular a lot of the time I would end up using JQuery alongside it because I didn't understand Angular or know it's full capabilities. After learning it better my code has continuously less JQuery in it, but if I can't figure it out in angular, I'll make sure it works with JQuery until I can get it.

I guess it depends on what you're aiming for. If you want to develop an Angular app, then Angular already includes a version of jQuery called jQlite, but you can still use jQuery in your Angular app if you want to.
You can actually "wrap" jQuery code into custom Angular directives, which is pretty sweet.
In an Angular app it's safe to include jQuery if you want to implement some Bootstrap functionality. Currently, I'm doing that to implement Bootstrap's collapse component. I have only just begun developing in Angular, so I am not an expert as to all the ins-and-outs of using jQuery with Angular.

Dart and third party CSS and JS frameworks

I am gearing up to create my first web application and I've been reading a lot about Google Dart. It looks like a very fun, exciting new approach to web development and I am strongly considering using it for my application.
There is one question that I've been unable to find a solid answer for, however: is it possible to use a CSS/JS framework with Dart? In this case, I'm interested in using Twitter Bootstrap. I'd like to take advantage of the fantastic layout tools, buttons, and javascript modules it provides.
Would it be possible to use Dart and Bootstrap at the same time?
Do I even need to use Bootstrap? Does Dart already provide or make it easy to create what Bootstrap provides?

Thanks for your question. Yes, you can use Bootstrap with a Dart app. Bootstrap is mostly a set of CSS presets, patterns, and styles. There are a few JavaScript powered Bootstrap plugins for more interactive behavior. Depending on what you want to do, those JavaScript plugins can operate independently of your Dart app.
Dart does not bundle anything like Bootstrap. You could use Dart to replicate the Bootstrap plugins, but there isn't much need to do that.

I created small sample. Use bootstrap into Dart.
https://github.com/ehr174/dartstrap

You might consider Bootjack -- a Bootstrap port in Dart.