Does anyone have any tips for gaining and maintaining weight?

Well, I used to weigh 145. Now 255. Secret is get older.

Weight gaining.....

You can increase your caloric intake by eating bigger meals three times a day & having snacks between meals but you may be so active or super active that your metabolism is off the charts and you are burning more calories than you consume?????

But rather than having some so called experts here suggest weight gaining I suggest you see a doctor or credited dietician.

Try incorporating a couple of tablespoons of peanut butter in between meals for some healthy weight gain.

If you consume more calories than your body needs, you will gain weight. There is nothing around it. I suggest using a smartphone app, like MyFitnessPal, to track your caloric intake. If you give it your current weight and your goal weight, it will tell you how much more (or less) you have to eat each day. It also gives you a lot of self-awareness about the caloric value of what you do eat. I definitely recommend it: https://www.myfitnesspal.com/

Try to stick to real food as much as possible. Try better food choices if you cant eat more quantity. While a person trying to lose weight should stick to fish and chicken, you should have more red meats on your diet. They pack a lot more calories per serving. Keep in mind that eating to look fit is not always the healthiest choice.

SPC(P) (Join to see) Pizza with lots of cheese.

The program I have been following for a year now along with the supplement plan that I got introduce to by a good friend has changed my life. I have been maintaining my weight where I like it and have been killing my PRs in the gym, not to mention my recovery time being cut in half. Hit me up.

Lift weights. Higher weight, fewer reps (5-8). Do less cardio outside of circuit workouts and ensure you take your protein within your anabolic window (30-45min after working out).
As far as the protein shakes, not all of them are created equal. Some taste good but have too much fat or lots of creatine (puts water in your muscles and can actually damage your body if you're not drinking lots of water). Others taste bad and others give you bad gas that clear buildings better than CS. Try out Cellucor Cinnamon Swirl Whey protein. It tastes like the milk left in your bowl after you eat Cinnamon Toast Crunch cereal. Ensure that you're taking 1g of protein per lb of body weight.
Look on bodybuilding forums about "bulking". You'll build muscle and fat and put on more eight. Bodybuilders then do a "cutting" phase with low weight, high reps, and more sets along with high-intensity interval cardio.

Any long-distance runs and similar low-intensity cardio will kill your gains. Don't listen to these other comments about eating garbage. Concentrate on building muscle since that's the intent of the weight limits anyway.

Lucky for you, you are having troubles putting the weight on rather than losing it. Being that I also go to a gym regularly, I would recommend doing more workout regimes with heavier weights or free weights for muscle gain being as though muscle weighs more than fat. Dedicate each day to a different weight class. One day for legs, another for chest, biceps, triceps, back, etc. I have a workout plan a fitness friend of mine gave to me. If you would like I can post it in the comments section and you can test it out for a few weeks and see how it is working for you. There are also a lot of great workout plans dedicated to the lucky individuals like you looking to put a little more weight on. Also, nutritional plans developed to help.

I recommend going onto body building.com and follow there guidelines. It is a wonderful site! How ever, you must be diligent on diet. My wife is a personal trainer and we use this site all the time. Good luck!
CW5 Gary Yeager