I have one more tip, that a lot of people dont realise:
As you are probably finding out inventory slots are in short supply, so the quicker the better you get more.
Maybe a bit of a spoiler here ..
On some planets you will randomly find Drop Pods, but they are often not easy to find and a bit of a process gathering resources to repair the drop pod to get an inventory slot, these drop pods look like an upside down ice cream cone with a door in one side. Easier is ..
You can get one easily at most space stations for your Exosuit, find the guy selling Exosuit upgrades and somewhere near him there's a thing you can click on to buy more slots.
You can only do this once per system, but ..
This is the spoiler bit - There is another type of station you can summon into the same system. Using the quick menu (x). Once you have that ability you will know what I mean. There are 4 upgrade vendors on that station too, and one has an Exosuit upgrade thing near him, which again can only be used once per system.
So you can get two inventory slots per system you are in, plus whatever Drop Pods you randomly find.
Something else not immediately obvious, when using the suit (or any other) upgrade, it will highlight a new slot you can buy in the Inventory slots, at this moment you can select with mouse or space bar (I think, its been a while since I had to do it) the tech inventory.