[Bry4n_1337]

I'm trying to learn basics of reverse engineering which program/software should I choose. (I'd rather stick to open source/free software)

[Unpaired]

Learn the basics of reverse engineering with Ghidra

[Nomad.Null]

Reverse Engineering by Dennis Yurichev is how I got started learning. I experimented with IDA at first, but you don't have to go hard into investing in a tool like that if you don't work for a company that has access to licenses.

https://beginners.re/

The book is solid and a great intro to the basics. And it's free. There are PDF versions on the web if you know where to look or are willing to become a patron of D. Yurichev.

[BlackSoulZN5006]

I would recommend you Ghidra.

[Codysalfen@gmail]

I would recommend you Ghidra.

High recommended since you're looking for a freeware

[happygonutty]

I'm trying to learn basics of reverse engineering which program/software should I choose. (I'd rather stick to open source/free software)

For practice purposes, I suggest you do capture the flag challenges that focuses on reverse engineering in order to enhance problem logic skills before diving into reverse engineering.

For software, I have never used Ghidra since I am old AF and there is no thing such as Ghidra from the early 2010s, the only tools I use mostly are HxD (for dynamic analysis [reading binary files]), PE File Explorer (to learn what language or tech stack was used on the binary), OllyDbg (for static analysis [running process]) and IDA Pro (to dive deeper). Also don't forget to put everything inside a VM (virtual machine) to not damage your host machine (main machine). The rest are history my friend. 🙃

[BlackSoulZN5006]

In Kali Linux the following programs are for reverse engineering, clang, clang++, NASM Shell, and radare2 under reverse engineering applications.

[snyk]

clang, clang++, NASM Shell in kali, hope i helped you