Post Closed as "duplicate" by Edwin Ashworth, Barmar, Drew, tchrist, Chenmunka of
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Since the version of the word "that""that" might matter to the correct answer, I'll provide the actual title in question:

Title: Existing Solutions thatthat Didn't Work

If someone could explain the why of the answer, I would be appreciative.

EDIT: It has been suggested that this is a duplicate, and that may be, in a sense. However, the after reading the suggested prior question, I'm no closer to my answer. I think it may have to do with my use of the word "that." Perhaps it is incorrect?

Using these definitions of the word "that:" I'm having trouble figuring out which definition of that matches my title. Am I even using it correctly? Perhaps I should use which instead:

Possible Title: Existing Solutions which Didn't Work

If my original usage is incorrect, and I should use which, then the answer is simple since which is always a pronoun or adjective, and those are both capitalized in a title. However, I'm having difficulty understanding which part of speech that is in my original title.

Since the version of the word "that" might matter to the correct answer, I'll provide the actual title in question:

Title: Existing Solutions that Didn't Work

If someone could explain the why of the answer, I would be appreciative.

Since the version of the word "that" might matter to the correct answer, I'll provide the actual title in question:

Title: Existing Solutions that Didn't Work

If someone could explain the why of the answer, I would be appreciative.

EDIT: It has been suggested that this is a duplicate, and that may be, in a sense. However, the after reading the suggested prior question, I'm no closer to my answer. I think it may have to do with my use of the word "that." Perhaps it is incorrect?

Using these definitions of the word "that:" I'm having trouble figuring out which definition of that matches my title. Am I even using it correctly? Perhaps I should use which instead:

Possible Title: Existing Solutions which Didn't Work

If my original usage is incorrect, and I should use which, then the answer is simple since which is always a pronoun or adjective, and those are both capitalized in a title. However, I'm having difficulty understanding which part of speech that is in my original title.

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Should I capitalize the word "that" in a title?

Since the version of the word "that" might matter to the correct answer, I'll provide the actual title in question:

Title: Existing Solutions that Didn't Work

If someone could explain the why of the answer, I would be appreciative.