I've tried many products. While many are slick and full of features, I just could never seem to work them into my flow easily enough. The only thing that works well for me is good ol' pen and paper.

Work related ideas are in gitlab.

Personal ideas are written down in an ideas book I have :)

Tack boards are handy if you're looking for a location to place ideas that you know you won't forget about, as it will be hanging on the physical wall.

The other "in your face" option is to string ideas up around your room like the stereotype of a conspiracy theorist. Best case scenario is you have some nice decoration and some difficult to forget ideas.