I have a question about upgrading weapons. I have a heart fire and I want to upgrade with a fire dragon ash but I can't because it takes a lot of rp. My forge level is just 50 and I don't know how to increase besides making weapons. Can anybody help me
The best way to increase forging and crafting skill is by upgrading weapons / armor. Just making a basic broadsword and upgrading it with 9 pieces of iron gets you a large amount of experience (that's the simplest/cheapest way, since you tend to acquire a massive amount of iron from mining.
Make sure to equip a Heart Pendant as well (if you have one), since it increases the amount of skill points you recieve.
And if you have lots of rp restoring items but not a lot of cash you can always opt for upgrading using turnip seeds.
Also be warned you will see diminishing returns with enhancing if you do a lot of it in one go. I have noticed that if I make some difficult weapons/armor to skill raise on that it helps dethrottle this and reduces the amount of enhancements I need to skill gain. Not sure if just waiting a few days also helps, I was already a pretty high on my crafting skills once I noticed.