Well, when it comes to specialisation, you have two possible paths from here:
1. You focus on tech small caps and dig into them, read their balance sheets and do your analysis. You can expect less competition from the big guys since those companies are so small that they offer not enough liquidity for them to trade.
Thus those companies are littered with daytraders, momentum traders and mom and pop investors who just trade based on price.
If you have more knowledge than them (you understand, what the PR actually means...), you can either buy such a small cap before everyone else does or short them as soon as they have a parabolic move on bullshit news.
2. You focus on the big techs and their correlation with their peers, component suppliers, subcontractors and dealers. Your emphasis should be on divergence/convergence within this universe. If a big tech company makes a big move, usually it's correlated stocks move in sympathy and here you can profit from your deeper knowledge again in order to either use the big one as an indicator to trade the sympathy play or call bullshit on the move of the smaller one.
The later is a little more complex since you have to know who does what for whom, which companies are competitors and so on.
You need to build a watchlist of the names in your universe and follow it like a hawk.
A small subcontractor just broke out cause the number of delivered units just went up 30%?
Who bought those units and why? Is it because the buyer is likely to have a plus on the sales side or because something went wrong and he has to replace broken units.
Figure that out before everyone else, and you have a trade.
A nice primer on building watchlists is "An End To The Bull" by Gary Norden.
I would grab that one right away, since it is also a primer on many things in the industry and will teach you what you can expect and how to build your carreer.
Good luck, have fun and take it easy