This will be a simple guide on how to handle things in the Beyond.
The guide will not feature step by step for every level, but will instead give tips on how to progress the fastest.

1. The most important rule of all, only the 2 or perhaps 3 most recent celestial bodies will do anything.
If u have only Sun in the start it will do something, but by the time u unlock earth, sun will be meaningless. Don't bother upgrading it with dark matter, cards or levels, unless needed for mission objective. Apply this logic over and over everytime u discover a new level.

2. Look at all your mission objectives right at the start. Which 2 or 3 will make u the most resources?
You can skip ahead and do the objectives in any order, always start with the one bringing u the most income. Don't follow the order the game suggests or u spend days longer progressing.
On some missions u can even click on a celestial body u are supposed to unlock eventually, much earlier by skipping ahead like this, saving even more time.

3. The constellation screen is cool, but what do u do on it? Truth be told, only four (or perhaps 5) of them have any meaning at all, the rest are useless.
You will buy those 4 in the following order to maximise profit. The order selected is also a long time investment as things will return at later levels.

A. Celestial body speed 1.5x, this is without a doubt the best one and the first one u will buy.
B. Dwarf planet speed 2x, this will help u alot when u unlock Pluto, but will keep coming back at later levels.
C. Star speed 2x. This is average, but only costs 4 constellation points making it a good one for later. Don't buy this first as sun is meaningless.
D. Ort cloud objects 2x speed. Finish with this one.
E. If u somehow have more constellation points over u can grab astronomy mission speed.

4. Speaking of astronomy missions, do all the moon missions as soon as possible.
Buy the extra research slot for 20 darwinium.

5. What do u do with extra darwinium?
You buy the big star for 100 darwinium. The game has 3 epic cards, 2x speed on everything, 2x income on everything and reduce cost by 50% on everything. If u get all those 3 u will save weeks if not months in your progress.

6. How to get extra darwinium?
There is a ingame code system where u can type in codes to get about 250 darwinium. The codes change somewhat at the start of every month, and the updated list of codes can be found at the wiki on the following link:
https://cell-to-singularity-evolution.fandom.com/wiki/Codes

7. Offline progress?
The game claims it has offline progress, which is somewhat true. However the offline progress is 10% or less compared to your online progress.
If u have the computer on, start the game and leave it on while u play other stuff. The whole idea of clicking in game, catching golden rocks and clicking on the right celestial body for some small income boost is not really worth your time.

8. Progress is slow, deal with it
It can take days of doing absolutely nothing to finish a level. Some levels have very mean end of level goals. Start the game, leave it on, check back whenever. If u don't like that idea, maybe find another game. Worst thing u can do is go in and expect fast progress with lots of interaction. This is not that kind of game.

When more levels are added into the beyond at a later date, this guide will be updated if needed. Until then, have fun idling away the known universe.