MALWARE - mean people can create a torrent and put malware in there posing as the .exe (or other types of EXECUTABLE files) you wanted so that they get you to open it and harm you.

How to tell malware?
I made a short list of what to do, and a long list where I explain and teach extensively.

SHORT VERSION:
a) Check if uploader is reputable
b) The more seeds there is - the more legit it is
c) Malware can't do harm to you unless you run it, don't panic
d) Scan the files with Windows Defender, antivirus software, and drop it to https://www.virustotal.com/gui/home/upload

LONG VERSION:
a) Check if uploader is reputable - when you get the magnet look if the person who first uploaded it (usually called uploader or OP) is reputable by having many popular torrents in their name over the years.

b) The more seeds there is - the more legit it is - malware most often has very few seeds! Nobody likes to spread malware after they have been harmed! So they usually have few people spreading them. (Keep in mind that low amount of seeds doesn't mean its malware, it only means you should be a little more cautious when running their .exe or other executable files). From my experience its super rare if you use reputable websites for torrenting (like piratebay, nyaa.si, rutracker and such), but be aware it may happen. Also a personal note: if you download a movie or music you should be getting a .mp4 file or a music file and not .exe! If you see an .exe inside movie or music or image torrent - it feels sketchy to me!

c) REMEMBER! Malware can only do you harm if you run it! Don't panic if you downloaded a sketchy program! It can't do any harm unless you explicitly run it!

d) Scan your files with antimalware software - you can check your .exe first by scanning it with Windows Defender (left click on the .exe and select Scan or something like it). You additionally can upload it to sites like https://www.virustotal.com/gui/home/upload because they scan your file with many antivirus programs for you. If there is no flags I would run it. If there are a few flags from some little known antivirus programs then I would usually ignore it as they are often false flags, but still be cautious.

Additional info: if you want to run programs even more safely consider using a virtual machine (abbreviated as VM). Its outside of scope of torrenting, research it on your own.