That’s not what you need protection from The thing is, when you start doing magick, even light magick like meditating to develop your spirit and senses, you start to shine brighter, and this attracts attention. The astral is teeming with life, and not all of it is benign.
As an analogy, imagine you want to go for a nice woodland walk to go bird watching… well, birds aren’t the only things in the woods… you might want some mosquito repellant as there’s more than birds in the trees, you might want a good pair of shoes as there are sharp twigs on the ground. It’s not unfair to the bird to wear shoes and clothes and mozzie repellent.
Now, the analogy breaks down at bit here because in magick, like attracts like, so one way of maintaining what we here call you “spiritual hygiene”, which means not being covered in ticks and flies, is to leverage this “like attracts like” and keep a super high vibration. Then lesser entities can’t see you so well and you don’t attract trouble. But we’re human, and it all it needs is an argument nearby, not even with you for negative energy to be in the mix and parasites an impostors to get involved.
So, check out the spiritual hygiene and parasites tutorials to find out what else you can get that wastes your time and energy and pretends to be what it’s not, and you will be prepared and know what to do if you run into any nasties.
“Cleanse” yourself and your space, and ideally your whole house and garden. As mentioned above you may want a banishing if you discover unwanted intruders (you almost certainly have a few, at least little ones, everybody does until they learn how to clean their space, it’s like having spiders indoors, they just happen). The tutorials explain multiple ways how. Have a browse through and use the ideas and techniques that draw you the most.
What do you say to human guests when they leave? “Thank you for coming, see you again some time.” Politeness costs nothing and these are people too.
Your space was cleaned BEFORE you started. Afterwards, setup wards, like magickal fences, to stop intruders. You don’t leave your front door open, wards are how to close and lock the “door”. Again, read through the tutorials, it’s all there, 10 years of forum advice, all for free.
And DO please, please try the search, you can add to these keywords to refine the kinds of wards and talismans and cleansings you want. Interested in a salt bath? Search on that and you’ll fine posts about it. There’s just so much here that gets missed all to often, it’s worth it imo.