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Many of the interjections I use are a bit vulgar since I live with a family that swears casually. I think I've got some less vulgar ones, though. The following four examples are frequently used "minced oaths" (religious sayings that have been made milder so they can be used informally without being disrespectful). All of them are used mainly to express either surprise or annoyance.

"Jeez!" is a milder way of saying "Jesus!" ("Jesus!" isn't particularly vulgar, but many people don't like "saying the lord's name in vain", so maybe it's best to avoid by default). It can be used when something or someone surprises or annoys you, and although it can be humorous and playful, it's usually negative in tone. "Ugh, jeez, he's such a jerk!"

"Holy moly!" is similar to "Jeez!", but I reach for it to emphasize extremes. "Holy moly, it's cold outside!"

"My goodness!" or "Oh my goodness!" is a milder version of "oh my God!". For me, it's very light and playful. Very rarely do I use it negatively. For example, a distant family member at a party might say to a younger family member something like, "I haven't seen you in so long! My goodness, you've grown!"

"Goodness gracious!" (or also "good gracious!") is quite similar to "Jeez!" or "Holy moly!" "Good gracious, what are you kids doing out there in this weather! Get inside!"

A few more general ones:

"Oops!" - used after making a mistake, forgetting something, etc. I think you've already got this one, just make sure there's only one "p".
"No way!" - used to express either disagreement or disbelief (maybe even excitement). "That band from Canada? Apparently, they're going on tour and they're gonna be in California!" "No way, dude! We gotta see that!"
"Oh no!" - used if something bad is happening or has happened.
"Uh oh." - used if something bad is probably *about* to happen.
"Umm" or "uhh" - used to fill space as you try to figure out what you want to say. However, I dislike using it too much in speech.
"Well..." - might not be as common as some of the others, but I might use this if something odd or awkward happens. "Umm... well, that just happened!"

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Others have already mentioned a lot of the good interjections, but I can add a few:
Cool!
Jeez! (short for Jesus)
Neat! (dated — my mom uses this)

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Of course. Here are some that you can use in many situations:
Oops!
Uh oh!
Oh no!
What?
Really?
No way!
As with everything, there are lists of these online, but it's a fun idea to have us tell you which we use or like.

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Some commonly used interjections are wow, yay, phew, yikes, ouch.

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Ah! Oh! Phew! Jinkes! (This was in a novel I read, can't remember the name now).

Link containing interjection examples: https://www.scribbr.com/parts-of-speech/interjections/&ved=2ahUKEwifhPmi7LiSAxUWWkEAHVsaGd0QFnoECEMQAQ&usg=AOvVaw0G_Y-0IpCXGR55LXNVXG0a

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Yay! Wow! - to express excitment, Ouch! - to express being hurt, Ugh!, Yuck! - to express dislike or disgust. I cannot think of other ones from the top of my head. I hope this helps.