If you want to master Polkadot JS, understanding the wallet features should be your top priority.

Recently, more people are entering the Polkadot ecosystem, but many are unaware that there are three main tools: UI, browser extension, and API. Especially around the Polkadot JS wallet, it often feels complicated for blockchain beginners.

Polkadot JS is essentially an integrated toolkit for interacting with the Polkadot network. From account management to asset transfers, staking, and more, you can do most things here. First, when you access the UI portal, you'll see organized functions such as accounts, transfers, staking, network status checks, and developer tools.

The browser extension is geared toward security-conscious users. It includes phishing protection, reducing worries about falling for suspicious sites. You can back up your account with JSON files or seed phrases, and it also integrates with Ledger hardware wallets.

To get started, install the extension, create a new account, set a password, and securely note your seed phrase—this is the basic process. Never lose your seed phrase. As long as you have it, you can recover your account even if your device breaks.

When you open the Polkadot JS UI, you can navigate to different functions from the left sidebar. In account management, you can add or back up existing accounts. The transfer section allows sending and receiving assets and viewing transaction history. The network section lets you check validator statuses and chain conditions, so you can monitor Polkadot's activity in real time.

For developers, there is the Polkadot JS API. With it, you can query blockchain data, create and send custom transactions, and develop cross-chain interactions. Using methods like api.query.* to fetch on-chain info and api.tx.* to execute transactions—simple code examples make it easy for anyone to get started.

In terms of security, multiple measures are in place: offline storage of seed phrases, phishing warning features, double confirmation for transactions, and recommended hardware wallet integration.

Reviewing the basics of the Polkadot network: DOT tokens are used for governance and rewards, and relay chains secure multiple parachains. Using XCM, message passing between parachains is possible. In other words, Polkadot JS is the gateway to this multi-chain world.

By the way, the "Introduction to Substrate Development and Project Practice" course, jointly organized by OneBlock+ and Polkadot, is now open for registration. It's free, so developers wanting to deepen their knowledge should check it out. There are also one-on-one consultations with industry leaders and AMA live sessions.

Mastering Polkadot JS will give you a comprehensive view of the Polkadot ecosystem. From wallet management to development, this toolkit covers it all—be sure to give it a try.