If you lose games where you make unsafe moves (of an easy level of difficulty, such as found in John Bain's "Chess Tactics for Students" book):
 
In study time in-between games: 

• Set aside about 50% of your study time for puzzles 
• Make most puzzles easy (roughly 950-1300 ChessTempo level; can also do some intermediate puzzles, endgame puzzles, etc) As a goal you want to recognize easy patterns not just solve them. I highly recommend John Bain's "Chess Tactics for Students"  and other basic tactics books.
• Be aware that in a game you will be finding these patterns for your opponent (not you) when visualizing your candidate moves, and if your opponent has such a pattern, likely the candidate move will be discarded.
• Play over instructive anthologies game books to learn about all kinds of strategic and tactics associated with common patterns. 
• Watch the videos where I either analyze verbally (like the 20 minute exercise) or play "thinking out loud" vs the computer. Pay attention to how I determine the safety of my candidate moves

During the game: 

• Set the time control to a slow enough time (30 5 or preferably slower like 45 45) to give yourself time to determine if your moves are safe. Speed games with a short increment (like 5 5) are OK to practice quickly safety recognition, openings, time management, etc (avoid games at ti;mes like 15 10 games for now – they encourage bad habits) 
• After an opponent’s move ask “What are ALL the things that move does?” (missing one can be fatal) and “Is that move safe?” 
• For your candidate moves, determine if they are safe. Not only visualize the move and look for patterns you study, but augment that with careful analysis of all possible dangerous opponent replies (checks, captures, and threats) and what you would do to safely meet them next move if one is played in reply to your candidate. Doing the homework should help do this more quickly and accurately. But to practice this you need enough time, which is a major reason I suggest longer time controls with an increment.
• If you can’t safely meet an opponent’s reply, you either have to reject the candidate or, rarely, consider it as a sacrifice. 
• After each move when the opponent is thinking, check your clock and ask if you are playing too fast or too slow; adjust accordingly.