if you guys are into woodwork, 99% of the them, it is about joining two pieces of wood together. There are many methods. Traditional, you can do the mortise joints or the dovetail joints. However, both these joints mean you need to have space to clamp your timber together.
These days, unless you have a big workshop, you would not have time to do it. So, now, the common four methods are dowels, dominos, biscuit or screws.
Dowels are cheap and you can buy cheap dowels. There are cheap machines that can help you to do it. However, you pay for what you get. IKEA uses dowels. Top brand, Mafell.
Dominos are more expensive. Festool is the main machine if you are into dominos.
Biscuits - the machine is super expensive that it is not even worth mention. However, it is very popular in the woodworking industry.
However, for home, I recommend, Kreg. Cheap and good. You can either get Kreg K4 or Kreg K5. You can make alot of the things with Kreg. Google on youtube. They have plenty of ideas. Get from Amazon, they have everything there. I recommend the Kreg clamp. If you want copied version, Aliexpress has plenty.
Check this out.
https://www.kregtool.com/get-inspired/project-ideas.aspx