You might remember the meaning of the character 渡 with this easy mnemonic:
When you're crossing the river, be aware of the droplets (氵) of ice falling off the dotted cliff (广). Cover your head with your two hands (廾), and before you take even one (一) step, check again (又) and again for danger!
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.