3. Constructing Buildings

So right now you have probably gone through the article of how to get your resources. The next big step is to understand what you need those resources for. The first thing you want to be building are the mines, in order to generate and maintain early resource demand. You should be constructing all the buildings, whenever you can also possibly upgrade them, as each of them has a specific benefit for your planet. Some of the benefits apply globally, some only to that specific planet. 
The important thing is to understand which upgrades are more beneficial than others. So you need to prioritize what buildings you want to upgrade first, as they will give you a better advantage. We recommend that you upgrade the following buildings to these levels as soon as you possibly can:  

Shipyard (at least level 16): As you know, each level of upgrading the shipyard gives you a reduced construction time for you ships. We recommend you upgrade the shipyard to at least level 16 because anything above that only reduces construction time by 3 seconds.

Nano-Robotics Lab(at least level 3): This building is so legit, you have no idea; however upgrading this is very expensive. Each level of this upgrade reduces building time by 50%! That’s right. 50%. So we suggest you get this to level 3 as soon as you can, giving you a 75% time reduction. You can opt to upgrade this to max level later on.

Robotics Lab(at least level 3): Each level of this also reduces the construction and upgrade time to buildings and upgrades. The difference to the Nano-Robotics Lab is that this building upgrades to more levels and is considerably cheaper, but then again has less effect. We recommend levelling this to at least 16.

Research Lab(at least level 17): Each level of Research Lab reduces the research time of technologies. The good thing is that you only need to upgrade one research lab as you can enjoy the benefits for all your planets. So for now, try to level it up to 17 or 18.

Alliance Deopt (at least level 1): You will need this eventually, so you don’t really need this in the beginning, however build this when you feel like joining or creating an alliance. Remember, this aspect of the game is really option.

Radar Facility (at least level 14): This building is very important so that you can prepare for ganks from enemies. Whenever an attack or probe is incoming, you get an early warning signal. The reason a Radar Facility at level 17 is good because at that level it detects Destroyers and Interceptors and everything below. After all, it would be a shame if you think you are prepared, and then you find out that you are going to get pwned.

While it is obvious that it's best to have every building upgraded to the maximum level if possible, remember that we are only suggesting this as an optimal route of efficiency. Anything above the recommended levels is of course better, but is also more expensive! We hope this gives you a good balance in the earlier stages of the game. Enjoy constructing your buildings now, friends!