Here we are going to talk about the most important gym equipment. We could say that with this you occupy 90% of what you are looking for.
This is certainly an investment, but it can give you a lot of flexibility and security if you start to load more weights. For example, without the rack in your gym equipment, you would have to first get a power clean for such a military press. And rather heavy sit-ups would be very difficult to carry out.
So we can say that the squat rack gives you more height to be able to select exercises that can be very worthwhile. With this, you do not have to worry about exercising without partners with heavy weights. For example, having a squat rack does not mean that you are going to try personal records with no one else at home. It is still dangerous and I am definitely against this.
One of the few exercises you cannot do with just bars or dumbbells are the ones you master. Unless you have a tree or iron rod on the roof by your house, this becomes unnecessary. But in case it is not, the chin-up is an excellent exercise that I personally never put aside. The good thing is that these are cheap compared to other equipment. I would even consider them as the main exercise.
As you will see in the online stores, there are different types of chin-up bars that you can buy in the market. Some can be mounted inside the door of your room, and others directly to the wall. This will be only a personal choice, not that some are better than the others. What only interests you is that you can bear your own weight and do not disturb the location where you decide to put it.
It is always a good addition to your home gym equipment. But in case that money and space are somewhat limited, you can consider the first two mentioned above. This gives you quite a few more options as far as lifts are concerned.
What can be more functional than lifting 8kg above your head and bouncing it against the ground as hard as you can! And do it over and over again. They are perfect to develop explosiveness, as well as being quite cheap.
It is simply something that helps you grip your barbell or dumbbell to simulate wider. With this you have to open more hand to grab and work more forearm, but honestly you can make them homemade if you want.