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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you really want to go at validator selection/staking by your own means, you can use this tool: https://james-sangalli.github.io/dot-validator-selector/ in combination with Polkadot-JS Apps.
It's more like the Polkadot Wiki is over 300 pages (printed out) already, and we're not always sure what is confusing or what information people may not know. It's always a good idea if you have an issue with it to file an issue on the Github, as I just did to add some more information on this here: https://github.com/w3f/polkadot-wiki/issues/3235
Related posts
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What are the risks of staking DOT natively? When a validator is slashed do I lose all my DOTs?
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There are 43 active parachains on Polkadot, not counting private ones, and 130 total announced projects headed for parachain status. When is the relay chain going to be upgraded to handle more than 100 parachains?
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Rewards Calculations via Polkadot.js Ledger Staking
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Governance
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KSM inflation.