Hi,
How to add Jquery,Bootstrap js files to our app.
Hi @saviobinny
Welcome to the community.
This is a topic which has come up before. Please see this answer which should help you solve the problem.
Please don’t hesitate to ask here if you have any further questions.
Just to expand on @mburridge’s answer:
In general, it is not necessary to use jquery in a frontity application, because anything you can do with jquery (and more) is achievable with react (frontity is based on react) 
Aside from that if you want to use Bootstrap with your CSS, the version 5.0 (which is in beta now) will not require jquery: https://blog.getbootstrap.com/2020/06/16/bootstrap-5-alpha/ so I think you should be able to just add it from the CDN or just download the file and it should work.
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