Decode String and Valid Palindrome ( NeetCode, LeetCode )

So, in this video I revisited some of the questions I'd solved before, like Decode and Encode Strings and Valid Palindrome, because active recall is the GOAT. I also solved Product of Array Except Self, but I didn't really understand it, so I'm not counting that one. I tried tackling a sliding window question for Best Time to Buy and Sell Stock, but that completely flew over my head as well. Still, I am keeping up the LeetCode/NeetCode grind.