I would always recommend starting with the [official documentation](https://www.cairo-lang.org/docs/) (especially [hands on path](https://www.cairo-lang.org/docs/hello_cairo/index.html#hello-cairo)) and the [playground](https://www.cairo-lang.org/playground/). Learning more about how Cairo works is also beneficial for a deeper understanding of the StarkNet ecosystem, but I think it is not necessary for the beginning.

Once you learn about data representation, you may also want to compare two `felt`s or `Uint256`s, since there are no number comparison operators like in standard languages. You can check `cmp` utils functions built into the language: [`math_cmp`](https://github.com/starkware-libs/cairo-lang/blob/master/src/starkware/cairo/common/math_cmp.cairo) and [`uint256_cmp`](https://github.com/starkware-libs/cairo-lang/blob/master/src/starkware/cairo/common/uint256.cairo).

If you're coming from a Solidity background, you probably heard about OpenZeppelin. They have a [repo with StarkNet contracts](https://github.com/OpenZeppelin/cairo-contracts) implemented in Cairo. I find it useful, not just as a good library, but as an inspiration for code abstraction and organization, and Cairo best practices.

Other useful resources:
* [Cairo Mummies](https://triality.org/education/course/cairomummies) courses
* [Cairo resources Twitter thread](https://mobile.twitter.com/Starknet_edu/status/1529371701334581249)
* [What is Cairo? Resources and Tools – Nostra Devs 01](https://mirror.xyz/0x845605C411132BAA06024a521a85B653F3C802dF/oOISOf8vdxf-uiXrAGJVYxXdXuW81IauMIC7RzrznLQ) (also there's `felt` and `Uint256` post on the blog).
* [Practical StarkNet lessons learned](https://hackmd.io/@RoboTeddy/BJZFu56wF)
* Not strictly Cairo resources, but useful for better understanding StarkNet: [STARK math Twitter thread](https://twitter.com/EliBenSasson/status/1578380154476208131)

There are many people who are pretty new to Cairo Language, so this thread is about some good resources, to begin with. What projects, educational courses, Github Repos etc. about StarkNet can you recommend?

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Newton

What resources (Github repos, projects) do you follow about Cairo Language? Why?

Hello! This is day 11 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Address of locals”.  Perhaps you can help me?

```
// When Cairo needs to retrieve the *address* of a local variable,
// it needs to be told the value of the frame pointer register, fp
// (see [here](https://cairo-lang.org/docs/how_cairo_works/functions.html#fp-register)).
//
// This can be done by setting a reference named __fp__ to the value, which
// can be obtained using the library function get_fp_and_pc().
//
// 1. Try to run the code as-is, and make sure you understand the error.
// 2. Uncomment the line setting __fp__, and run again.
//    The code should now work and you should be able to see that `x` was set
//    to 1000.
// 3. Uncomment the line calling foo() and try to run the code.
//    Fix the code by adding exactly one word to it.
//    Hint: Revisit the "Revoked references" challenge.

from starkware.cairo.common.registers import get_fp_and_pc

// Returns a^3 for a != 0 and 1 otherwise.
func foo(a) -> (res: felt) {
    if (a == 0) {
        return (res=1);
    } else {
        return (res=a * a * a);
    }
}

func main() -> () {
    alloc_locals;

    // let (__fp__, _) = get_fp_and_pc();
    local x: felt;
    // let (x) = foo(a=10);
    local y: felt* = &x;
    assert [y] = 1000;
    return ();
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

How to use get_fp_and_pc in Cairo Lang?

How does Argent X wallet estimate fees in Starknet before sending a tx?

I use `ec.getKeyPair("copy paste from argent x")` to initialize the account however i get the response is invalid, with respect to the public key

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Invalid response while using `ec.getKeyPair("copy

How do I move my Pathfinder node to another server / disk?

How do I get started with starknetjs?

Is there any way to abi-encode calldata to pass to `account.execute`? Also is `contract.invoke` going to be deprecated in the future? IIRC <> mentioned something related to that at the meetup.

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

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Is there any way to abi-encode calldata to pass to `account.execute`? 

What will the bundler ecosystem look like in AA?

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What resources (Github repos, projects) do you follow about Cairo Language? Why?

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