There are too many reasons for finding an alternative to photoshop
First: Photoshop is relatively heavy and not any laptop or PC could run the latest versions of it smoothly.
Second: Photoshop has really really advanced options that you might never even use, and most photoshop users utilize only 30% of its options, so it's a bit complex for many people.
Third: Photoshop is a paid option, and you might for any reason not want to download the cracked version of it.
So for all these reasons and more, I highly recommend that you use GIMP which is the best alternative to Photoshop, it's totally free and it's lighter than photoshop and probably will run on any PC or Laptop.
So go ahead and download GIMP which is in my humble opinion a better option, and also it depends on what you use it for.
Also, it's so similar so if you ever used photoshop you won't have any problems with it.
Hope this was helpful, and I wish you the greatest luck with content creation, and thanks for your precious time.