You need to eat way more, without nutrients you wont gain. If you lack appetite, start exercising anyway, appetite will come soon. Consider drinking kefir, if its cheap in your country, its like drinking milk, but better. Don't focus on theory too much, know-how will come with time. Don't pay too much attention to progress. Get pic related and use it while browsing internet or whenever, grip strength will help you with many things in life. Something got you angry? Good, don't waste that frustration, exercise it away.