CaptainSauce
Super Poster
If you put GTA and combat in as separate tags it's pretty much the same thing. Similar to how you don't need to put in GTA gameplay, just gameplay is fine and people looking for 'Witcher 3 gameplay' won't have your GTA video show up. Searches are smart and take into consideration combinations and variations of tags. If you're still confused, you can look up big YouTubers videos and check out their tags. It's helpful in getting an idea what are popular things to include. Either way you look at it, stuff like "gaming industry" is not going to net you results.