Right on, isn't this the forum though....

Theres no activity on the Paradox one, whats the new forum?

Planetary improvement advice also depends on your game-situation. Keeping morale a bit higher than usual by building a single morale building on every planet is useful, even if it is to allow you to build one population increasing structure... but not always!Just think about what you need and build that. If you need more specific advice I'd recommend asking a more specific question (fill in some of the wildly differing and very important circumstances, such as "early game" "large galaxy with few planets" at "tough").

There are some general strategies towards building your planets. Spreading out production and research buildings can be your strategy, or you can optimise planets for each... The "big" debates are quite often along the lines of specialised planets vs general purpose planets. The reason that debate doesn't have a clear outcome is because for all intents and purposes, game-mechanically speaking the production difference isn't that big and strategically speaking there is something to be said for both (general planets make you less vulnerable to losing one and waste less resources building new ships, optimised planets give a bit more overall output and can produce big ships faster) and it comes down to player-preference.

And before I forget: welcome to the forum!