What do you do when you have a new exciting idea, but can't work on it right away?

Put it down as a notion doc and structure it properly. Why it excites me, what the problem is, a very rough draft of the solution, and its potential. Reading this after some time puts me in the same frame of mind I was when I got the idea and helps in working on it again. This takes < 3 mins mostly.

Write it down and keep thinking of reasons why it won't work. It sounds negative, but if even after a lot of these reasons the idea seems good, you should pursue it. The period before execution (fact-finding / research whatever you want to call it) is extremely important.

I agree with your write it down and leave it method. It's good to offload it and get my focus back to what I'm working on. That said, sometimes I'll do a quick bit of research to give me an indication one way or the other on what the opportunity looks like.

Write it down and expand on it as much as possible. After that, I will figure out how important this idea is for my future plans and goals if it makes sense to invest in it and after that, I will decide a time to execute it.

Hey, I write down in a notebook initially, and maybe play around with some sketches but I always (since quite recently) add them into a notion template, which I feel makes them official ideas! I got the notion tip from @nonken and use it all of the time now, it's a great app for things like this. If not notion, I would say add the lists to a tool you frequent daily (to-do app, etc..). Keep them in front of mind. Worth checking it out.

This question interests me a lot, cause I faced this phenomenon and perhaps everyone is, so I came about with a big book I called I'D Flow or Idea flow where I would define the idea, the problem it could solve, and some simple research. But as time passed by I noticed this trail in almost every entrepreneur so I again got an idea of creating a social forum or network for thinkers where people could easily add, manage and discuss ideas and get co-founders and funding or feedback whether it is viable, i designed the front end of it but never did the back end untill now and the guy I was working on it with just let me down, so what do you think as you brought this up again?

Buy a domain and wait for the domain renewal to show up 😍

Also, it would be interesting to see if the existing ideas are present in the market and how companies or people are working on them. It brings a new perspective to our own ideas.

I normally just write it down as a note, each month I try to go through my notes and decide which have potential and which dont.