Most resume advice is about what to add: stronger verbs, real numbers, tighter bullets. Just as much of what separates a polished resume from an amateur one is what's absent. None of the items below will single-handedly sink an application, but each one is a small, avoidable tell, and it's worth cutting all of them.
Drop the pronouns
A resume is written in implied first person — the "I" is understood, never stated. Starting a bullet with the pronoun instead of the action verb is also, not coincidentally, one of the most common weak-opener patterns.
Skip the photo, and skip age, gender, or marital status
Most US employers and applicant tracking systems expect a resume with no photo, and no age, gender, or marital-status information anywhere on it. A photo invites unconscious bias before a single qualification is read, and none of the rest is relevant to whether you can do the job. If you're applying somewhere a photo is genuinely customary, that's a deliberate regional exception, not the default.
"References available upon request"
This line is assumed by every reader already. A hiring manager who wants references will ask for them; stating the obvious just spends a line of space that could hold another accomplishment. Drop it, and don't list actual reference names and numbers on the resume either — that's a separate document, provided only when asked for.
Don't open a bullet with a date
Dates belong on the entry (role/company header), not leading a bullet — a reader skimming for what you did shouldn't have to scan past a date first.
Spell out the abbreviation the first time
An abbreviation obvious to you may not be obvious to whoever screens the resume first, recruiters and early-stage screeners aren't always subject-matter experts in your specific field. Spell out an uncommon acronym or abbreviation the first time it appears, then abbreviate freely after that.