A professional instructor will be able to teach you advanced techniques and music theory that can develop your guitar-playing skills. Search online for instructors near you and read reviews online to see past student experiences. Once you sign up and attend your first class, tell the instructor what your goals are and how much experience you have before they start teaching. Beginner guitar books and manuals include lessons, drills, and examples that will help develop your guitar playing skills. In addition, some books may also include charts that will help you play specific chords. Popular guitar books for beginners include the Guitar Chord Bible, Complete Technique for Modern Guitar, and Guitar for Absolute Beginners. There are a ton of tutorials on Youtube and other video streaming sites that will help you develop your guitar playing technique. Watch the videos to learn more about music theory, chords, notes, and progressions. Popular guitar Youtube channels include JustinGuitar, GuitarLessons.com, and JamPlay. Guitar tabs are a simple way to learn how to position your hand to play certain tunes. The number on the tabs represent the fret that you should play, while the lines on the tabs represent the string that you'll play the note on. Tabs put the top string, or 6th string, on the bottom line, the 5th string on the second to bottom line, and so on. Tabs do not designate how long to hold a note or chord, so you'll have to listen to the song that you want to play as you learn it. For instance, if the tab had 1-1-1 on the top line of the tab, that would mean that you strum the bottom string, or 1st string, 3 times in a row. The easiest way to play popular songs is to use guitar tabs. Look up the tablature for the song that you want to play, then practice perfecting it. Start off by playing simple songs that only have a few notes and chords, then advance to more elaborate songs with many different parts. Playing other people's songs will teach you popular chords and progressions.
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One-sentence summary -- Take guitar lessons from an instructor. Read guitar books and guides. Watch Youtube videos to learn more advanced techniques. Learn how to read and play guitar tabs. Cover songs that you enjoy.

Sometimes it can be tricky to know if tickling will be viewed as cute and playful or annoying and inappropriate. Consider your location (if you are in public, he might not appreciate giggling madly in front of a bunch of people), and his current mood. If you've just been fighting or he's angry, now might not be a good time to poke and prod him. Listen to what he's saying. If he's confiding in you that he's heartbroken over his dog's death, he probably needs a hug more than he needs tickle torture. Wait until you're somewhere relatively private and have room to wrestle a little and not injure yourselves. Make sure he's not holding a hot beverage or something that might injure him or you when you catch him by surprise. Don't try to tickle him when he's playing video games or absorbed in something that is really important to him (even if you are annoyed that he's not paying attention to you). This is when tickling is just annoying, not fun. If you two are joking around and he's in a good mood, he probably won't mind a little tickle. Your tickle attack will fail if it turns out your boyfriend isn't even ticklish. Do a little exploring first to figure out where he's most ticklish. The most vulnerable spots on the body are also the most ticklish Poke him in his side, just above his hip or in his ribs and see if he giggles. Give him a hug and "accidentally" tickle his armpit. This is one of the more ticklish spots on most people. If he's laying down with his shoes off, gently run your toes along the bottom of his feet and notice his reaction. Kiss him gently on the neck and exhale through your nose so the air hits his ear. See if he gets goosebumps on his neck. Sharp nails might be good for tickling if you plan to just graze them over his skin (like on the underside of his feet or the back of his neck). But if you plan to really get into a tickle war, sharp nails may become painful.
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One-sentence summary --
Determine if it's the right time and place. Figure out if he's ticklish. Make sure your nails aren't too sharp.