The budget of water heating and electricity is collectively referred to as the installation budget. Need to understand the principle, familiar with the quota and calculation rules. There are many kinds of installation, so choose a branch that you can approach and practice best, such as process pipeline installation and electrical equipment installation. It's best to go to the construction site for internship, study while constructing, and compare the quota with the work. Don't be too ambitious, master one first, and then go deep into other analogies based on experience, you know. For books on the budget, you can read some introductory books first and buy two less, which is very similar. A book that reads basic drawings should also be 1-2. Study plan: work during the day, be familiar with technology, study budget at night, and study while working.