Assorted fixes (#666)

* fix: typos

* refactor: link and wording

* refactor: assorted

content/courses/native-onchain-development/deserialize-custom-data-frontend.md

@@ -44,7 +44,7 @@ Solana, but the pattern is familiar:
 - You can also consider PDAs as records in a database, with the address being
   the primary key used to look up the values inside.
 
-PDAs combine a program addresss and some developer-chosen seeds to create
+PDAs combine a program address and some developer-chosen seeds to create
 addresses that store individual pieces of data. Since PDAs are addresses that
 lie _off_ the Ed25519 Elliptic curve, PDAs don't have secret keys. Instead, PDAs
 can be signed for by the program address used to create them.

content/courses/onchain-development/intro-to-onchain.md

@@ -37,7 +37,7 @@ synchronized system:
 - **devnet**: For application development
 - **localnet**: For local testing
 
-The program that run on Solana - the ones that create tokens, swap tokens, art
+The programs that run on Solana - the ones that create tokens, swap tokens, art
 marketplaces, escrows, market makers, DePIN apps, auctions, retail payments
 platforms, etc - are called **Solana apps**.
 
@@ -131,17 +131,17 @@ to store any form of data as required by the program.
      is a `PublicKey`, PDA addresses are not public keys and do not have a
      matching private key.
    - A program's PDAs are unique so, they won't conflict with other programs.
-   - PDAs can also act as signer in an instruction. We'll learn more about this
+   - PDAs can also act as signers in an instruction. We'll learn more about this
      in further lessons.
 
 #### Examples of PDA Usage
 
-| Purpose           | Seeds                      | Resulting PDA                |
-| ----------------- | -------------------------- | ---------------------------- |
-| Exchange Rate     | `"USD"`, `"AUD"`           | Stores USD to AUD rate       |
-| User Relationship | User1 wallet, User2 wallet | Stores relationship data     |
-| Product Review    | User wallet, Product ID    | Stores user's review         |
-| Global Config     | `"config"`                 | Stores program-wide settings |
+| Use Case          | Seeds                          | PDA (Key)       | Value (Data Stored)                        |
+| ----------------- | ------------------------------ | --------------- | ------------------------------------------ |
+| Exchange Rate     | `["USD", "AUD"]`               | Derived address | Current USD to AUD exchange rate           |
+| User Relationship | `[user1_wallet, user2_wallet]` | Derived address | Relationship data (e.g., friends, blocked) |
+| Movie Review      | `[reviewer_wallet, "titanic"]` | Derived address | Review text, rating, timestamp             |
+| Global Config     | `["config"]`                   | Derived address | Program-wide settings                      |
 
 #### Benefits
 

content/courses/program-security/account-data-matching.md

@@ -224,11 +224,13 @@ The `insecure_withdraw` instruction handler transfers all the tokens in the
 
 <Callout>
 
-Notice that this instruction handler \***\*does\*\*** have a signer check for
+Notice that this instruction handler **does** have a signer check for
 `authority` and an owner check for `vault`. However, nowhere in the account
 validation or instruction handler logic is there code that checks that the
 `authority` account passed into the instruction handler matches the `authority`
-account on the `vault`. </Callout>
+account on the `vault`.
+
+</Callout>
 
 ```rust
 use anchor_lang::prelude::*;

content/courses/program-security/reinitialization-attacks.md

@@ -186,9 +186,10 @@ pub struct User {
 [Anchor's `init_if_needed` constraint](https://www.anchor-lang.com/docs/account-constraints),
 guarded by a feature flag, should be used with caution.It initializes an account
 only if it hasn't been initialized yet. If the account is already initialized,
-the instruction handler will still execute, so
-it's \***\*\*\*\***extremely\***\*\*\*\*** important to include checks in your
-instruction handler to prevent resetting the account to its initial state.
+the instruction handler will still execute, so it's **extremely** important to
+include checks in your instruction handler to prevent resetting the account to
+its initial state.
+
 </Callout>
 
 For example, if the `authority` field is set in the instruction handler, ensure

content/courses/tokens-and-nfts/nfts-with-metaplex.md

@@ -899,13 +899,12 @@ endless!
 
 The steps covered above for creating an NFT would be incredibly tedious to
 execute for thousands of NFTs in one go. Many providers, including Metaplex,
-Magic Eden, and Tensor have so-called 'fair launch' tools that take care of
+MagicEden, and Tensor have so-called 'fair launch' tools that take care of
 minting large quantities of NFTs and ensuring they are sold within the
-parameters set by their creators. Dive into fair launch platforms on the
-[Digital Collectables](https://solana.com/ecosystem/explore?categories=digital%20collectibles)
-page. This hands-on experience will not only reinforce your understanding of the
-tools but also boost your confidence in your ability to use them effectively in
-the future.
+parameters set by their creators. Dive into one of these fair launch platforms
+and create an NFT. This hands-on experience will not only reinforce your
+understanding of the tools but also boost your confidence in your ability to use
+them effectively in the future.
 
 <Callout type="success" title="Completed the lab?">
 Push your code to GitHub and