I really like the suggestion Suggestion: Bookmark Post. Since there is no way to bookmark the post why not put all good post in this single post?

I will put all post, which I felt good. If you have any of your favorite post put it in the comments. I will update this post to include other post.

Algorithms

1. https://leetcode.com/problems/combination-sum/discuss/16502/A-general-approach-to-backtracking-questions-in-Java-(Subsets-Permutations-Combination-Sum-Palindrome-Partitioning)
2. https://leetcode.com/problems/find-all-anagrams-in-a-string/discuss/92007/Sliding-Window-algorithm-template-to-solve-all-the-Leetcode-substring-search-problem
   2 a. https://leetcode.com/problems/minimum-window-substring/discuss/26808/here-is-a-10-line-template-that-can-solve-most-substring-problems
3. https://leetcode.com/problems/palindrome-partitioning/discuss/182307/Java:-Backtracking-Template-General-Approach
4. https://leetcode.com/problems/spiral-matrix-ii/discuss/22289/My-Super-Simple-Solution.-Can-be-used-for-both-Spiral-Matrix-I-and-II
5. https://leetcode.com/problems/minimum-size-subarray-sum/discuss/59110/on-template-for-minimum-size-subarray-sum-minimum-window-substring-longest-substring-without-repeating-characters
6. https://leetcode.com/problems/number-of-islands/discuss/56354/1D-Union-Find-Java-solution-easily-generalized-to-other-problems

System Design

1. https://leetcode.com/discuss/career/229177/My-System-Design-Template
2. https://leetcode.com/discuss/general-discussion/276595/System-Design-Preparation-Materials