Yes, you understood correctly. In fact you can stay in Laos for up to 30 days visa free.
If you have not come across it, here is the page with more complete information https://www.laos-guide-999.com/visa-exemption.html.
FYI: All ASEAN member countries can visit one another visa free for up to 30 days. Well...Brunei and Myanmar give only 14 days for ordinary passport holders of ASEAN member countries.
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I need to know, can I pass the border between Nong Khai and Vientiane if my passport expires in 3 months? But I have the certificate from the Russian Consulate