The challenge page has some seemingly random text on it that we presumably need to decode.
Notice that the text ends with two equals signs, which should instantly give away that the text is base64 or similar. Indeed, if we use a tool like https://gchq.github.io/CyberChef/ and select "base64" as the CyberChef recipe, we get out a sequence of numbers:
67 121 98 101 114 99 104 101 102 32 105 115 32 97 32 103 111 111 100 32 116 111 111 108 32 102 111 114 32 116 104 105 115 32 107 105 110 100 32 111 102 32 116 104 105 110 103 10 102 108 97 103 123 99 104 97 108 108 101 110 103 101 50 45 65 120 71 67 102 89 109 85 72 66 97 87 66 69 89 66 84 114 122 71 113 86 89 113 76 125
Multi-layer encryption, how secure! These numbers are ASCII values for characters, so again using a recipe like "from decimal", we get our plaintext:
Cyberchef is a good tool for this kind of thing
flag{challenge2-AxGCfYmUHBaWBEYBTrzGqVYqL}
Our flag is:
<aside> 💡 flag{challenge2-AxGCfYmUHBaWBEYBTrzGqVYqL}
</aside>