The best starter trap build will undoubtedly be a 4 gas trap. For those who don't know, a 4 gas trap is a trap that uses 4 gases to damage and/or kill the target. The gases used in a 4 gas trap are usually methane, hydrogen sulfide, carbon dioxide, and nitrogen dioxide.
The reason a 4 gas trap is the best starter trap build is because it is very effective and can be built relatively cheaply. methane, hydrogen sulfide, and nitrogen dioxide are all gases that are relatively easy to obtain, and carbon dioxide can be easily obtained as well. The only gas that may be difficult to obtain is methane, but it can be easily obtained by buying a canister of it.
Methane, hydrogen sulfide, and nitrogen dioxide are all incredibly toxic gases, and carbon dioxide is also deadly in high concentrations. When used in a trap, these gases can be incredibly effective at damaging and/or killing a target.
One of the benefits of a 4 gas trap is that it can be easily adapted to any situation. If you want to damage a target, you can use a lower concentration of gas. If you want to kill a target, you can use a higher concentration of gas. This flexibility makes a 4 gas trap the best starter trap build.
If you're looking to build a trap, I highly recommend a 4 gas trap. It is an incredibly effective trap that can be built relatively cheaply and easily adapted to any situation.