What other programs will I need to do every step of the game making process that Unreal Engine cannot provide?

I need to know what I cannot do in Unreal Engine that I will need other apps and programs to do. For example, If I need another program to create 3d scenery objects and making the textures look proper on them before importing them into Unreal Engine, the idea is that someone will tell me.

Thank you. I figured it “could” be used for everything, but I also figured it would be better to use others

Believe it or not, depending on your game’s specific needs, you don’t need any.
There are already many assets and asset packs available for free use. Blueprints work for a number of scripting purposes, and if you wanna do it really dirty, you can even make super simple meshes with shape brushes.

I personally also use several free tools as well as a few paid ones externally for asset creation, source control, and programming.

Notably, I have used:
Visual Studio Community - programming
Krita / GIMP - super simple 2d art
Blender - 3d models

which pretty much cover all of my specific needs well, and for free.
hope this helps,
-Spiris

I thank you for your opinions, however, it does not matter where my strengths lie. I am looking purely for the tools with which I can make the parts of the game that Unreal Engine cannot or cannot do well

it depends on where your strengths lie and what premade things you are planning to use / buy. for instance if your not great at art you may want to buy assets or look into using something like magicaVoxel or assetForge. for animations theres always mixamo though i dont know their terms of use. if you want to create your own sounds well theres a ton for that. personally i use blender and krita the most these days since im cheap (hobbyist). for simple 2d i also use PaintDotNet since its really easy to use and allows rapid dev for prototyping.

below are some links to some site for assets

https://opengameart.org/art-search-advanced?keys=&field_art_type_tid[]=13&sort_by=count&sort_order=DESC

the majority of games will require 3d models and textures to be made outside of the unreal engine. Most of the tools you are likely to need are free and open source. Blender, krita, inkscape, crazybumb ect.

The only paid program that doesn’t have a good free alternative and is very useful is substance painter.

It terms of hardware that you may need (or may be helpful) depending on what you’re doing. A decent computer for sculpting 3d assets, a mic and electric keyboard to make sound effects, a camera to make textures for realistic games, vr headset, playstation, xbox for testing on those platforms.

Various other software:
NVIDIA GameWorks, flowmap painter http://teckartist.com/?page_id=107, github/sourcetree(for sourcecontrol), artstation account (for showing off your work), audacity, freesound.org.

Voice acting and music composition may require hiring people.
Then you should market your game, which will require working with various outside programs, facebook, youtube, reddit ect.
When you publish the game you’ll have to put it on steam and like outlets. might have to figure out how to make cds.