[austin-cheney]

If you only have 3 months then forget learning technologies or padding a resume. Real skills are only measured in years of experience and often require some form of demonstration.

Instead seek entry level certifications. I recommend Security+ and what ever the entry level AWS cert is.

If you want to ignore all this advise and absolutely have to focus on a technology skill then master everything there is to know about data transmission. Learn the OSI model, HTTP, WebSockets, gRPC, certificates, and so on. Read the RFCs several times. In order to really attain mastery you should plan on studying 45-50 hours per week minimum with that time being intense dedicated focus.

Transmission mastery is what got me my current job, but in all fairness I was at it for more than 3 months. I had written an original WebSocket library a few years earlier and improved upon it over time. Despite the current industries most esteemed experts telling me one thing regarding the relationship between HTTP and WS I was able to prove them wrong, with working code, by demonstrating that HTTP could be served over WS and that WS does not have to be served over HTTP as many claim. Insights like that takes longer than 3 months to realize.