Tips and tricks:

• Makeup goes bad, so keep an eye on expiration dates, especially for mascara. Look for a symbol like this:

The number tells you how many months you have from opening the product until it expires. I pay most attention to this for mascara - I don’t want to get an eye infection just because I was too cheap to buy a new mascara! For any other kind of makeup, if it’s getting older, I make sure it looks and smells okay before I use it. If the texture or smell of a product has changed, there’s a decent chance it’s gone bad, and I chuck it. Better safe than sorry!

• Always do your makeup in a well-lit area. It’s easy to overdo on foundation or blush if you’re working in a poorly-lit room!
• When starting out, you might want to try softer colors like brown mascara instead of black, or a soft lip tint instead of a bold red lip. Bold makeup is great but it takes practice to make it look good, so I’d advise waiting on bold looks until you have your technique down.
• There are tons of makeup tutorials on YouTube. I’d recommend poking around to find someone who has similar coloring to you and wears makeup that you like. One Beauty YouTuber that I really like is Angela Bright. She does a lot of tutorials with easy soft glam looks, and she really takes the time to explain what products, brushes, and techniques she’s using. Plus she just seems like a good human :)
• I mentioned this in another comment, but setting spray can really help your makeup last.